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大家有没有遇到自定义的类，无法用equals方法比较成员属性呀？那是因为需要重写equals方法

重写原理这里偷个懒，idea中 alt+insert 快捷键，快速实现重写equals噢！

Student类：

package objectequal;

import java.util.Objects;

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

    public Student() {
    }

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

测试类：

package objectequal;

public class Test {

    public static void main(String[] args) {

        Student s1 = new Student("wxw",22);
        Student s2 = new Student("wxw",22);

        String s3="wwx";
        String s4="wwx";

        System.out.println("String类型的可用equals比较，相同返回true，不同返回false");
        System.out.println("s3.equals(s4)):"+s3.equals(s4));
        System.out.println("自定义的Student类，无法使用equals比较");
        System.out.println("s1.equals(s2):"+s1.equals(s2));

    }

}

 

重写equals后的Student类：

package objectequal;

import java.util.Objects;

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

    public Student() {
    }

    public Student(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;
        Student student = (Student) o;
        return age == student.age && Objects.equals(name, student.name);
    }

   
}

重写equals后，可以比较Student类的成员属性