equals方法

equals方法的作用:
      Object类中的一个方法,用与比较对象地址值,返回true或flase
重写equals方法:      当不想比较对象的地址值而想要比较对象的属性内容时,需要通过重写equals方法来实现
重写equals方法的方式:
       alt + insert  选择equals() and hashCode()，IntelliJ Default，一路next，finish即可
示例代码:

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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;     }       @Override     public boolean equals(Object o) {         //this -- s1         //o -- s2         if (this == o) return true;         if (o == null || getClass() != o.getClass()) return false;           Student student = (Student) o; //student -- s2           if (age != student.age) return false;         return name != null ? name.equals(student.name) : student.name == null;     } } public class ObjectDemo {     public static void main(String[] args) {         Student s1 = new Student();         s1.setName("潘长江");         s1.setAge(60);         Student s2 = new Student();         s2.setName("潘长江");         s2.setAge(60);           //比较两个对象的内容是否相同         System.out.println(s1.equals(s2));     } }