要想使用自定义类的equals方法,就必须重写这个方法
public class Person {
private String name;
private String sex;
private int age;
public Person() {
super();
}
public Person(String name, String sex, int age) {
super();
this.name = name;
this.sex = sex;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public boolean equals(Object obj) {
boolean bool = false;
if(obj == null){
return bool;
}
if(obj == this){
return true;
}
if(obj.getClass() == this.getClass()){
Person p = (Person)obj;
if(p.name.equals(this.name) && p.age == this.age && p.sex.equals(this.sex)){
return true;
}
}
return bool;
}
}
public class Test {
public static void main(String[] args) {
Person p = new Person("jack","man",33);
Student s = new Student();
ArrayList al = new ArrayList();
al.add(new Person("jack3","man",33));
al.add(new Person("jack","man",33));
System.out.println(al.indexOf(new Person("jack","man",33)));
}
}
输出结果是:1