//没有重构equals方法。
//Cat.java
public class Cat{}
//Program.java
public class Program{
public static void main(String[] args){
Cat cat1 = new Cat();
Cat cat2 = new Cat();
System.out.println(cat1.equals(cat2)); //false
String s1 = new String();
String s2 = new String();
System.out.println(s1.equals(s2)); // 同样是对象，此处为何是true ?
}
}
3 回答
yanrun
TA贡献317条经验 获得超240个赞
看一下String的源码
public boolean equals(Object anObject) {
if (this == anObject) {
return true;
}
if (anObject instanceof String) {
String anotherString = (String)anObject;
int n = value.length;
if (n == anotherString.value.length) {
char v1[] = value;
char v2[] = anotherString.value;
int i = 0;
while (n-- != 0) {
if (v1[i] != v2[i])
return false;
i++;
}
return true;
}
}
return false;
}就是把两个String转换成字符串数组然后遍历比较
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