String+=?

 

源代码：

 

public class Main {

 

public static void main(String args[]){

String a="a"+"b"+"c";

a+="d";

a+="e";

System.out.println(a);

}

 

}

 

 

编译后：

import java.io.PrintStream;

 

public class Main

{

 

    public Main()

    {

    }

 

    public static transient void main(String args[])

    {

        String a = "abc";

        a = (new StringBuilder(String.valueOf(a))).append("d").toString();

        a = (new StringBuilder(String.valueOf(a))).append("e").toString();

        System.out.println(a);

    }

}