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);
}
}