==操作符:
equals操作符:
public class Main {
public static void main(String[] args) {
Person p1 = new Person();
Person p2 = new Person();
System.out.println(p1.equals(p2));
System.out.println(p1==p2);
}
}
输出:
false
false
public class Main {
public static void main(String[] args) {
Person p1 = new Person();
Person p2 = p1;
System.out.println(p1.equals(p2));
System.out.println(p1==p2);
}
}
输出:
true
true
public class Main {
public static void main(String[] args) {
String a1 = "hello";
String b1 = "hello";
System.out.println(a1.equals(b1));
System.out.println(a1==b1);
String a2 = new String("hello");
String b2 = new String("hello");
System.out.println(a2.equals(b2));
System.out.println(a2==b2);
}
}
输出:
true
true
true
false
说明:a1和b1指向的是同一个String,而a2和b2指向不同的String,所以a2.equals(b2)只比较值返回true,==比较引用返回false。