在java中为啥要重写toString 方法？

　为了打印我们想要的对象信息，而不是类名加哈希值。

定义对象，看重写前后的输出：

package com.ruoyi.reserve.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;

import java.util.Objects;

/**
 * @author zs
 * @date 2019/12/24 15:42
 */
//@Data
//@AllArgsConstructor
//@NoArgsConstructor
//@EqualsAndHashCode(callSuper = false)
public class Person {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Person() {

    }

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        Person person = (Person) o;
        return age == person.age && Objects.equals(name, person.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }

//    @Override
//    public String toString() {
//        return "Person{" +
//                "name='" + name + '\'' +
//                ", age=" + age +
//                '}';
//    }
}

package com.ruoyi.reserve.study.basic;

import com.ruoyi.reserve.pojo.Person;

import java.util.*;

/**
 * create by MrZs on 2020/8/20
 */
public class ObjectTest {

    /*public static void main(String[] args) {

        Person p1 = new Person("Alice", 25);
        Person p2 = new Person("Alice", 25);
        Person p3 = p1;
        //==比较的是对象的引用，对象的引用存储在栈中，对象的引用是对象在堆中的地址。
        System.out.println("p1:" + p1);//p1:com.ruoyi.reserve.pojo.Person@deb6432
        System.out.println("p2:" + p2);//p2:com.ruoyi.reserve.pojo.Person@28ba21f3
        System.out.println("p3:" + p3);//p3:com.ruoyi.reserve.pojo.Person@deb6432

        System.out.println("p1==p2:" + (p1 == p2));//p1==p2:false
        System.out.println("p1==p3:" + (p1 == p3));//p1==p3:true

        System.out.println("p1 equals p2:" + (p1.equals(p2)));//p1 equals p2:false
        System.out.println("p1 equals p3:" + (p1.equals(p3)));//p1 equals p3:true

        System.out.println("p1.hashCode:" + p1.hashCode());//p1.hashCode:233530418
        System.out.println("p2.hashCode:" + p2.hashCode());//p2.hashCode:683287027
        System.out.println("p3.hashCode:" + p3.hashCode());//p3.hashCode:233530418

        System.out.println("p1.System.identityHashCode:" + System.identityHashCode(p1));//p1.System.identityHashCode:233530418
        System.out.println("p2.System.identityHashCode:" + System.identityHashCode(p2));//p2.System.identityHashCode:683287027
        System.out.println("p3.System.identityHashCode:" + System.identityHashCode(p3));//p3.System.identityHashCode:233530418

    }*/

    public static void main(String[] args) {

        Person p1 = new Person("Alice", 25);
        Person p2 = new Person("Alice", 25);
        Person p3 = p1;
        //==比较的是对象的引用，对象的引用存储在栈中，对象的引用是对象在堆中的地址。
        System.out.println("p1:" + p1);//p1:Person{name='Alice', age=25}
        System.out.println("p2:" + p2);//p2:Person{name='Alice', age=25}
        System.out.println("p3:" + p3);//p3:Person{name='Alice', age=25}

        System.out.println("p1==p2:" + (p1 == p2));//p1==p2:false
        System.out.println("p1==p3:" + (p1 == p3));//p1==p3:true

        System.out.println("p1 equals p2:" + (p1.equals(p2)));//p1 equals p2:true
        System.out.println("p1 equals p3:" + (p1.equals(p3)));//p1 equals p3:true

        System.out.println("p1.hashCode:" + p1.hashCode());//p1.hashCode:1963862394
        System.out.println("p2.hashCode:" + p2.hashCode());//p2.hashCode:1963862394
        System.out.println("p3.hashCode:" + p3.hashCode());//p3.hashCode:1963862394

        System.out.println("p1.System.identityHashCode:" + System.identityHashCode(p1));//p1.System.identityHashCode:233530418
        System.out.println("p2.System.identityHashCode:" + System.identityHashCode(p2));//p2.System.identityHashCode:683287027
        System.out.println("p3.System.identityHashCode:" + System.identityHashCode(p3));//p3.System.identityHashCode:233530418


        Set set = new HashSet();
        set.add(p1);
        set.add(p2);
        System.out.println(set);

        Map m = new HashMap();
        m.put(p1, p1);
        m.put(p2, p2);

        System.out.println(m);
        System.out.println(System.identityHashCode(m.get(p1)));
        System.out.println(System.identityHashCode(m.get(p2)));
    }


}

重写前：

"C:\Program Files\Java\jdk1.8.0_161\bin\java.exe" "-javaagent:D:\idea2022\IntelliJ IDEA 2022.2.2\lib\idea_rt.jar=53858:D:\idea2022\IntelliJ IDEA 2022.2.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_161\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_161\jre\lib\resources.jar;C:\Program 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:\config\maven\repository-zs\org\jboss\logging\jboss-logging\3.4.1.Final\jboss-logging-3.4.1.Final.jar;E:\config\maven\repository-zs\org\springframework\spring-web\5.2.12.RELEASE\spring-web-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-webmvc\5.2.12.RELEASE\spring-webmvc-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-aop\2.2.13.RELEASE\spring-boot-starter-aop-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\aspectj\aspectjweaver\1.9.6\aspectjweaver-1.9.6.jar;E:\config\maven\repository-zs\com\alibaba\druid-spring-boot-starter\1.2.6\druid-spring-boot-starter-1.2.6.jar;E:\config\maven\repository-zs\com\alibaba\druid\1.2.6\druid-1.2.6.jar;E:\config\maven\repository-zs\com\github\penggle\kaptcha\2.3.2\kaptcha-2.3.2.jar;E:\config\maven\repository-zs\com\jhlabs\filters\2.0.235-1\filters-2.0.235-1.jar;E:\config\maven\repository-zs\com\github\oshi\oshi-core\5.7.5\oshi-core-5.7.5.jar;E:\config\maven\repository-zs\net\java\dev\jna\jna\5.8.0\jna-5.8.0.jar;E:\config\maven\repository-zs\net\java\dev\jna\jna-platform\5.8.0\jna-platform-5.8.0.jar;E:\project\nengy-backend\ruoyi-system\target\classes;E:\project\nengy-backend\ruoyi-quartz\target\classes;E:\config\maven\repository-zs\org\quartz-scheduler\quartz\2.3.2\quartz-2.3.2.jar;E:\config\maven\repository-zs\com\mchange\mchange-commons-java\0.2.15\mchange-commons-java-0.2.15.jar;E:\project\nengy-backend\ruoyi-common\target\classes;E:\config\maven\repository-zs\org\springframework\spring-context-support\5.2.12.RELEASE\spring-context-support-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-security\2.2.13.RELEASE\spring-boot-starter-security-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\security\spring-security-config\5.2.8.RELEASE\spring-security-config-5.2.8.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\security\spring-security-core\5.2.8.RELEASE\spring-security-core-5.2.8.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\security\spring-security-web\5.2.8.RELEASE\spring-security-web-5.2.8.RELEASE.jar;E:\config\maven\repository-zs\com\github\pagehelper\pagehelper-spring-boot-starter\1.3.1\pagehelper-spring-boot-starter-1.3.1.jar;E:\config\maven\repository-zs\org\mybatis\spring\boot\mybatis-spring-boot-starter\2.1.4\mybatis-spring-boot-starter-2.1.4.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-jdbc\2.2.13.RELEASE\spring-boot-starter-jdbc-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\com\zaxxer\HikariCP\3.4.5\HikariCP-3.4.5.jar;E:\config\maven\repository-zs\org\springframework\spring-jdbc\5.2.12.RELEASE\spring-jdbc-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\2.1.4\mybatis-spring-boot-autoconfigure-2.1.4.jar;E:\config\maven\repository-zs\org\mybatis\mybatis\3.5.6\mybatis-3.5.6.jar;E:\config\maven\repository-zs\org\mybatis\mybatis-spring\2.0.6\mybatis-spring-2.0.6.jar;E:\config\maven\repository-zs\com\github\pagehelper\pagehelper-spring-boot-autoconfigure\1.3.1\pagehelper-spring-boot-autoconfigure-1.3.1.jar;E:\config\maven\repository-zs\com\github\pagehelper\pagehelper\5.2.1\pagehelper-5.2.1.jar;E:\config\maven\repository-zs\com\github\jsqlparser\jsqlparser\4.0\jsqlparser-4.0.jar;E:\config\maven\repository-zs\javax\validation\validation-api\2.0.1.Final\validation-api-2.0.1.Final.jar;E:\config\maven\repository-zs\org\apache\commons\commons-lang3\3.9\commons-lang3-3.9.jar;E:\config\maven\repository-zs\com\fasterxml\jackson\core\jackson-databind\2.10.5.1\jackson-databind-2.10.5.1.jar;E:\config\maven\repository-zs\com\fasterxml\jackson\core\jackson-core\2.10.5\jackson-core-2.10.5.jar;E:\config\maven\repository-zs\com\alibaba\fastjson\1.2.76\fastjson-1.2.76.jar;E:\config\maven\repository-zs\commons-io\commons-io\2.10.0\commons-io-2.10.0.jar;E:\config\maven\repository-zs\commons-fileupload\commons-fileupload\1.4\commons-fileupload-1.4.jar;E:\config\maven\repository-zs\org\apache\poi\poi-ooxml\4.1.2\poi-ooxml-4.1.2.jar;E:\config\maven\repository-zs\org\apache\poi\poi\4.1.2\poi-4.1.2.jar;E:\config\maven\repository-zs\commons-codec\commons-codec\1.13\commons-codec-1.13.jar;E:\config\maven\repository-zs\org\apache\commons\commons-collections4\4.4\commons-collections4-4.4.jar;E:\config\maven\repository-zs\org\apache\commons\commons-math3\3.6.1\commons-math3-3.6.1.jar;E:\config\maven\repository-zs\com\zaxxer\SparseBitSet\1.2\SparseBitSet-1.2.jar;E:\config\maven\repository-zs\org\apache\poi\poi-ooxml-schemas\4.1.2\poi-ooxml-schemas-4.1.2.jar;E:\config\maven\repository-zs\org\apache\commons\commons-compress\1.19\commons-compress-1.19.jar;E:\config\maven\repository-zs\com\github\virtuald\curvesapi\1.06\curvesapi-1.06.jar;E:\config\maven\repository-zs\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;E:\config\maven\repository-zs\io\jsonwebtoken\jjwt\0.9.1\jjwt-0.9.1.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-data-redis\2.2.13.RELEASE\spring-boot-starter-data-redis-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\data\spring-data-redis\2.2.12.RELEASE\spring-data-redis-2.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\data\spring-data-keyvalue\2.2.12.RELEASE\spring-data-keyvalue-2.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\data\spring-data-commons\2.2.12.RELEASE\spring-data-commons-2.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-tx\5.2.12.RELEASE\spring-tx-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-oxm\5.2.12.RELEASE\spring-oxm-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\io\lettuce\lettuce-core\5.2.2.RELEASE\lettuce-core-5.2.2.RELEASE.jar;E:\config\maven\repository-zs\io\netty\netty-common\4.1.58.Final\netty-common-4.1.58.Final.jar;E:\config\maven\repository-zs\io\netty\netty-handler\4.1.58.Final\netty-handler-4.1.58.Final.jar;E:\config\maven\repository-zs\io\netty\netty-resolver\4.1.58.Final\netty-resolver-4.1.58.Final.jar;E:\config\maven\repository-zs\io\netty\netty-buffer\4.1.58.Final\netty-buffer-4.1.58.Final.jar;E:\config\maven\repository-zs\io\netty\netty-codec\4.1.58.Final\netty-codec-4.1.58.Final.jar;E:\config\maven\repository-zs\io\netty\netty-transport\4.1.58.Final\netty-transport-4.1.58.Final.jar;E:\config\maven\repository-zs\io\projectreactor\reactor-core\3.3.13.RELEASE\reactor-core-3.3.13.RELEASE.jar;E:\config\maven\repository-zs\org\reactivestreams\reactive-streams\1.0.3\reactive-streams-1.0.3.jar;E:\config\maven\repository-zs\org\apache\commons\commons-pool2\2.7.0\commons-pool2-2.7.0.jar;E:\config\maven\repository-zs\eu\bitwalker\UserAgentUtils\1.21\UserAgentUtils-1.21.jar;E:\config\maven\repository-zs\javax\servlet\javax.servlet-api\4.0.1\javax.servlet-api-4.0.1.jar;E:\config\maven\repository-zs\org\eweb4j\fel\0.8\fel-0.8.jar;E:\config\maven\repository-zs\org\antlr\antlr-runtime\3.4\antlr-runtime-3.4.jar;E:\config\maven\repository-zs\org\antlr\stringtemplate\3.2.1\stringtemplate-3.2.1.jar;E:\config\maven\repository-zs\antlr\antlr\2.7.7\antlr-2.7.7.jar;E:\config\maven\repository-zs\com\googlecode\aviator\aviator\3.3.0\aviator-3.3.0.jar;E:\config\maven\repository-zs\commons-beanutils\commons-beanutils\1.8.3\commons-beanutils-1.8.3.jar;E:\config\maven\repository-zs\commons-logging\commons-logging\1.1.1\commons-logging-1.1.1.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-freemarker\2.2.13.RELEASE\spring-boot-starter-freemarker-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\freemarker\freemarker\2.3.30\freemarker-2.3.30.jar;E:\project\nengy-backend\ruoyi-generator\target\classes;E:\config\maven\repository-zs\org\apache\velocity\velocity\1.7\velocity-1.7.jar;E:\config\maven\repository-zs\commons-lang\commons-lang\2.4\commons-lang-2.4.jar;E:\config\maven\repository-zs\commons-collections\commons-collections\3.2.2\commons-collections-3.2.2.jar;E:\config\maven\repository-zs\org\projectlombok\lombok\1.18.16\lombok-1.18.16.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-configuration-processor\2.2.13.RELEASE\spring-boot-configuration-processor-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\apache\xmlbeans\xmlbeans\3.1.0\xmlbeans-3.1.0.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-websocket\2.2.13.RELEASE\spring-boot-starter-websocket-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-messaging\5.2.12.RELEASE\spring-messaging-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-websocket\5.2.12.RELEASE\spring-websocket-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-test\2.2.13.RELEASE\spring-boot-starter-test-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter\2.2.13.RELEASE\spring-boot-starter-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-starter-logging\2.2.13.RELEASE\spring-boot-starter-logging-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;E:\config\maven\repository-zs\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;E:\config\maven\repository-zs\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;E:\config\maven\repository-zs\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;E:\config\maven\repository-zs\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;E:\config\maven\repository-zs\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-test\2.2.13.RELEASE\spring-boot-test-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\boot\spring-boot-test-autoconfigure\2.2.13.RELEASE\spring-boot-test-autoconfigure-2.2.13.RELEASE.jar;E:\config\maven\repository-zs\com\jayway\jsonpath\json-path\2.4.0\json-path-2.4.0.jar;E:\config\maven\repository-zs\net\minidev\json-smart\2.3\json-smart-2.3.jar;E:\config\maven\repository-zs\net\minidev\accessors-smart\1.2\accessors-smart-1.2.jar;E:\config\maven\repository-zs\org\ow2\asm\asm\5.0.4\asm-5.0.4.jar;E:\config\maven\repository-zs\jakarta\xml\bind\jakarta.xml.bind-api\2.3.3\jakarta.xml.bind-api-2.3.3.jar;E:\config\maven\repository-zs\jakarta\activation\jakarta.activation-api\1.2.2\jakarta.activation-api-1.2.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter\5.5.2\junit-jupiter-5.5.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter-api\5.5.2\junit-jupiter-api-5.5.2.jar;E:\config\maven\repository-zs\org\opentest4j\opentest4j\1.2.0\opentest4j-1.2.0.jar;E:\config\maven\repository-zs\org\junit\platform\junit-platform-commons\1.5.2\junit-platform-commons-1.5.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter-params\5.5.2\junit-jupiter-params-5.5.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter-engine\5.5.2\junit-jupiter-engine-5.5.2.jar;E:\config\maven\repository-zs\org\junit\vintage\junit-vintage-engine\5.5.2\junit-vintage-engine-5.5.2.jar;E:\config\maven\repository-zs\org\apiguardian\apiguardian-api\1.1.0\apiguardian-api-1.1.0.jar;E:\config\maven\repository-zs\org\junit\platform\junit-platform-engine\1.5.2\junit-platform-engine-1.5.2.jar;E:\config\maven\repository-zs\junit\junit\4.12\junit-4.12.jar;E:\config\maven\repository-zs\org\mockito\mockito-junit-jupiter\3.1.0\mockito-junit-jupiter-3.1.0.jar;E:\config\maven\repository-zs\org\assertj\assertj-core\3.13.2\assertj-core-3.13.2.jar;E:\config\maven\repository-zs\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;E:\config\maven\repository-zs\org\mockito\mockito-core\3.1.0\mockito-core-3.1.0.jar;E:\config\maven\repository-zs\net\bytebuddy\byte-buddy\1.10.19\byte-buddy-1.10.19.jar;E:\config\maven\repository-zs\net\bytebuddy\byte-buddy-agent\1.10.19\byte-buddy-agent-1.10.19.jar;E:\config\maven\repository-zs\org\objenesis\objenesis\2.6\objenesis-2.6.jar;E:\config\maven\repository-zs\org\skyscreamer\jsonassert\1.5.0\jsonassert-1.5.0.jar;E:\config\maven\repository-zs\com\vaadin\external\google\android-json\0.0.20131108.vaadin1\android-json-0.0.20131108.vaadin1.jar;E:\config\maven\repository-zs\org\springframework\spring-core\5.2.12.RELEASE\spring-core-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-jcl\5.2.12.RELEASE\spring-jcl-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-test\5.2.12.RELEASE\spring-test-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\xmlunit\xmlunit-core\2.6.4\xmlunit-core-2.6.4.jar" com.ruoyi.reserve.study.basic.ObjectTest
p1:com.ruoyi.reserve.pojo.Person@750e297a
p2:com.ruoyi.reserve.pojo.Person@750e297a
p3:com.ruoyi.reserve.pojo.Person@750e297a
p1==p2:false
p1==p3:true
p1 equals p2:true
p1 equals p3:true
p1.hashCode:1963862394
p2.hashCode:1963862394
p3.hashCode:1963862394
p1.System.identityHashCode:233530418
p2.System.identityHashCode:683287027
p3.System.identityHashCode:233530418
[com.ruoyi.reserve.pojo.Person@750e297a]
{com.ruoyi.reserve.pojo.Person@750e297a=com.ruoyi.reserve.pojo.Person@750e297a}
683287027
683287027

Process finished with exit code 0

重写后：

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h\json-path\2.4.0\json-path-2.4.0.jar;E:\config\maven\repository-zs\net\minidev\json-smart\2.3\json-smart-2.3.jar;E:\config\maven\repository-zs\net\minidev\accessors-smart\1.2\accessors-smart-1.2.jar;E:\config\maven\repository-zs\org\ow2\asm\asm\5.0.4\asm-5.0.4.jar;E:\config\maven\repository-zs\jakarta\xml\bind\jakarta.xml.bind-api\2.3.3\jakarta.xml.bind-api-2.3.3.jar;E:\config\maven\repository-zs\jakarta\activation\jakarta.activation-api\1.2.2\jakarta.activation-api-1.2.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter\5.5.2\junit-jupiter-5.5.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter-api\5.5.2\junit-jupiter-api-5.5.2.jar;E:\config\maven\repository-zs\org\opentest4j\opentest4j\1.2.0\opentest4j-1.2.0.jar;E:\config\maven\repository-zs\org\junit\platform\junit-platform-commons\1.5.2\junit-platform-commons-1.5.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter-params\5.5.2\junit-jupiter-params-5.5.2.jar;E:\config\maven\repository-zs\org\junit\jupiter\junit-jupiter-engine\5.5.2\junit-jupiter-engine-5.5.2.jar;E:\config\maven\repository-zs\org\junit\vintage\junit-vintage-engine\5.5.2\junit-vintage-engine-5.5.2.jar;E:\config\maven\repository-zs\org\apiguardian\apiguardian-api\1.1.0\apiguardian-api-1.1.0.jar;E:\config\maven\repository-zs\org\junit\platform\junit-platform-engine\1.5.2\junit-platform-engine-1.5.2.jar;E:\config\maven\repository-zs\junit\junit\4.12\junit-4.12.jar;E:\config\maven\repository-zs\org\mockito\mockito-junit-jupiter\3.1.0\mockito-junit-jupiter-3.1.0.jar;E:\config\maven\repository-zs\org\assertj\assertj-core\3.13.2\assertj-core-3.13.2.jar;E:\config\maven\repository-zs\org\hamcrest\hamcrest\2.1\hamcrest-2.1.jar;E:\config\maven\repository-zs\org\mockito\mockito-core\3.1.0\mockito-core-3.1.0.jar;E:\config\maven\repository-zs\net\bytebuddy\byte-buddy\1.10.19\byte-buddy-1.10.19.jar;E:\config\maven\repository-zs\net\bytebuddy\byte-buddy-agent\1.10.19\byte-buddy-agent-1.10.19.jar;E:\config\maven\repository-zs\org\objenesis\objenesis\2.6\objenesis-2.6.jar;E:\config\maven\repository-zs\org\skyscreamer\jsonassert\1.5.0\jsonassert-1.5.0.jar;E:\config\maven\repository-zs\com\vaadin\external\google\android-json\0.0.20131108.vaadin1\android-json-0.0.20131108.vaadin1.jar;E:\config\maven\repository-zs\org\springframework\spring-core\5.2.12.RELEASE\spring-core-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-jcl\5.2.12.RELEASE\spring-jcl-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\springframework\spring-test\5.2.12.RELEASE\spring-test-5.2.12.RELEASE.jar;E:\config\maven\repository-zs\org\xmlunit\xmlunit-core\2.6.4\xmlunit-core-2.6.4.jar" com.ruoyi.reserve.study.basic.ObjectTest
p1:Person{name='Alice', age=25}
p2:Person{name='Alice', age=25}
p3:Person{name='Alice', age=25}
p1==p2:false
p1==p3:true
p1 equals p2:true
p1 equals p3:true
p1.hashCode:1963862394
p2.hashCode:1963862394
p3.hashCode:1963862394
p1.System.identityHashCode:233530418
p2.System.identityHashCode:683287027
p3.System.identityHashCode:233530418
[Person{name='Alice', age=25}]
{Person{name='Alice', age=25}=Person{name='Alice', age=25}}
683287027
683287027

Process finished with exit code 0

　　object类里的toString只是把字符串的直接打印，数字的要转化成字符再打印，而对象，则直接打印该对象的hash码。

posted @ 2020-01-08 10:40 慎终若始阅读(498) 评论(0) 编辑收藏举报

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在java中为啥要重写toString 方法？

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