java例程练习（String类对象相等问题）

public class Test { public static void main(String[] args) { String s1 = "hello"; String s2 = "world"; String s3 = "hello"; System.out.println(s1 == s3); //true System.out.println(s1.equals(s3));//true s1 = new String("hello"); s2 = new String("hello"); System.out.println(s1 == s2);//false System.out.println(s1.equals(s2));//true char c[] = {'s', 'u', 'n', ' ', 'j', 'a', 'v', 'a'}; String s4 = new String(c); String s5 = new String(c, 4, 4); System.out.println(s4);//sun java System.out.println(s5);//java } }