getClass，hashCode，toString方法

public class Student {
    private String name;
    private int age;

    public Student() {

    }

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

    //快捷键：Alt+insert+toString()
    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

public class Application   {
    public static void main(String[] args) {

        Student s1 = new Student("a",18);
        Student s2 = new Student("b",17);
        //getClass方法
        //判断s1和s2是不是同种类型
        Class<? extends Student> Class1 = s1.getClass();
        Class<? extends Student> Class2 = s2.getClass();
        if(Class1==Class2){
            System.out.println("s1和s2属于同种类型");
        }else{
            System.out.println("s1和s2不属于同种类型");
        }
        //s1和s2属于同种类型

        System.out.println("===========================");

        //hashCode方法
        System.out.println(s1.hashCode());//1324119927
        System.out.println(s2.hashCode());//990368553
        //s1和s2哈希值不同

        System.out.println("===========================");

        //toString方法
        System.out.println(s1.toString());//Student{name='a', age=18}
        System.out.println(s2.toString());//Student{name='b', age=17}

        System.out.println("===========================");

        //equals方法:判断两个对象是否相等-->比较两个对象地址是否相同
        System.out.println(s1.equals(s2));//false

        Student s3 = new Student("张三", 16);
        Student s4 = new Student("张三", 16);
        //s3和s4在堆中地址不同
        System.out.println(s3.equals(s4));//false
    }
}