Java基础入门:Java常用核心类

Object类 根类 终极父类

package com.cnblogs.wanson;

public class Driver {
    String name;
    Integer age;

    public Driver(String name, Integer age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
//重写toString方法
 /*   @Override
    public String toString() {
        return "Driver{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }*/
}




import com.cnblogs.wanson.Driver;

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class Driver_Test {
    public static void main(String[] args) {
        Driver driver = new Driver("wanson", 18);
//        方法1
        System.out.println(driver.toString());
//        方法2
        System.out.println(driver);


        /*案例1*/

        System.out.println("随机数案例");
        Random random = new Random();
        System.out.println(random);

        Scanner scanner = new Scanner(System.in);
        System.out.println(scanner);


        /*案例2*/
        System.out.println("集合ArrayLista案例");
        ArrayList<Integer> arrayList = new ArrayList<Integer>();
        arrayList.add(11);
        arrayList.add(12);
        arrayList.add(15);
        System.out.println(arrayList);


        /*equals()方法使用*/
        Driver driver1 = new Driver("a,", 12);
        Driver driver2 = new Driver("b", 18);
//       打印地址
        System.out.println(driver1);
        System.out.println(driver2);
//        打印hash值
        System.out.println(driver2.hashCode());
        System.out.println(driver2.hashCode());
        System.out.println(driver1.equals(driver2));
        driver1 = driver2;//driver2的地址复制给driver1

        System.out.println(driver1.equals(driver2));


    }


}