我必须创建一个 equals 方法,如果政客的头衔相同,则该方法返回 true。如何比较字符串?
到目前为止,这就是我尝试编写的方式:
public class Politician implements Priority{
private String name, title;
private int a;
public Politician(String n, String t, int p){
name=n;
title=t;
a=p;
}
public boolean equals(Politician a){
if(title.equals(a.title))
return true;
return false;
}
但是,它总是返回 false。即使当我测试时:
Priority t4= new Politician("Arnie", "Governor", 4);
Politician t5= new Politician("Bill", "Governor", 10);
System.out.println(t5.equals(t4));
System.out.println(t4.equals(t5));
我以前写过 equals() ,但不知道为什么它不再起作用
最佳答案
public boolean equals(Politician a) 不会覆盖 java.lang.Object 类中的 equals 方法。
声明为public boolean equals(Object a)以覆盖该方法。
public boolean equals(Object a) {
Politician p = (Politician) a;
return title.equals(p.title);
}
顺便说一句,即使在 Politician 类中 title 是私有(private)的,在 Politician 类中使用 p.title 也是完全合法的。查看这篇文章:Access private field of another object in same class
关于java - 使用java比较字符串,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33447445/