import javax.swing.*;
public class concat {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String str1="abc";
String str2="def";
String s="";
s= str1.concat(str2);
// s="str1连接str2的结果是:"+str1+str2;
// System.out.printf("%s", s);
JOptionPane.showMessageDialog(null, s,"字符串的连接",JOptionPane.INFORMATION_MESSAGE);
}
}