多项选择题： 程序如下：∥Java_1. java∥********** Found **********Import ( 1 ) ;public class Jav

程序如下：

∥Java_1. java

∥********** Found **********

Import ( 1 ) ;

public class Java_1

public static void main(String args[ ])

String s1="hashcode",

s2="HashCode";

String output="""+s1+""的Hash码是"+s1. hashCode( )+"""+s2+""的Hash码

是"+s2. hashCode( );

JOptionPane. showMessageDialog ( null, output,"显示字符串类的hash码",

∥********** Found **********

JOptionPane. ( 2 ) );

System. exit(0);