java String 的比较

 1 public class StringCom {
 2 
 3     public static void main(String[] args) {
 4         String a = "hello";
 5         String b = "hello";
 6         String c = new String("hello");
 7         char d[] = {‘h‘,‘e‘,‘l‘,‘l‘,‘o‘};
 8         
 9         System.out.println(a==b);  //true
10 
11         System.out.println(a==c);  //false
12  
13         System.out.println(a==d);  // Incompatible operand types String and char[]
14 
15         System.out.println(a.equals(d)); //false , 提示:Unlikely argument type for equals(): char[] seems to be unrelated to String
16         
17         System.out.println(a.equals(new String("hello")));  //true
18 
19     }
20 
21 }