String的拼接和常量池

1.常量池(constant pool)

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public class linkString {public static void main(String[] args) {String s1 = "刘宁";String s2 =  "是逗比";String s3 =  "刘宁是逗比";String s4 = s1+s2;//编译时不能确定下来，无法直接引用常量池中的字符串System.out.println(s3==s4);String s5 = "刘宁"+"是逗比";//编译时就确定下来，直接引用常量池中的字符串System.out.println(s3==s5);}}