[多项选择题] 程序如下：∥Java

[多项选择题]

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);

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