import javax.swing.*;
public class StringTest2 {
public static void main(String args[]){
String s1,s2,s3,s4,output; s1=new String ("good morning"); s2=new String ("John"); s3=new String("How are you"); s4=new String(" how are you"); output="s1="+s1+"\ns2="+s2+"\ns3="+s3+"\ns4"+s4+"\n\n"; if(s1.equals("hello")) output+="s1 equals\"hello\"\n"; else output+="s1 dose not equal\"hello\"\n"; if (s3.equalsIgnoreCase(s4)) output+="s3 equals s4\n"; else output+="s3 dose not equal s4\n"; if(s3.regionMatches(0,s4,0,5)) output+="First 5 characters of s3 and s4 match\n"; else output+="First 5 characters of s3 and s4 do not match\n"; if(s3.regionMatches(true,0,s4,0,5)) output+="First 5 characters of s3 and s4 match\n"; else output+="First 5 characters of s3 and s4 do not match\n"; output+="s1与s4˜qžæŽ¥èµäh¥æ˜¯ï¼š"+s1.concat(s4)+"\n"; output+="the first\"day\"of s4 is :"+s4.indexOf("you")+"\n"; output+="the last\"day\"of s4 is :"+s4.lastIndexOf("we"); JOptionPane.showMessageDialog(null,output,"Demonstring String Class CONstructors",JOptionPane.INFORMATION_MESSAGE); System.exit(0);
} 
}//p133
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public class StringTest1 { public static void main(String args[]){ char c1[]={'t','o','m','i','s','a','b','o','y'}; String s1="good morning"; String s2=new String(); String s3=new String(c1); String s4=new String(c1,6,3); System.out.println("s1 is :"+s1); System.out.println("s2 is:"+s2); System.out.println("s3 is:"+s3); System.out.println("s4 is:"+s4); }}
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class ExampleStringBuffer {public static void main(String[] buf){StringBuffer sb=new StringBuffer("test");System.out.println("buffer="+sb);System.out.println("length="+sb.length());System.out.println("capacity="+sb.capacity());}}
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class Const {public static void main(String[] args){ char chars1[]={'t','e','s','t'}; char chars2[]={'t','e','s','t','1'}; String s1=new String(chars1); String s2=new String(chars2); System.out.println("Value of String s1 is :"+s1); System.out.println("Value of String s2 is:"+s2); System.out.println("他们都是å—符串\"test\"!");}}
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import javax.swing.*;public class InputTest { public static void main(String args[]){ String name=JOptionPane.showInputDialog("What is your name?"); String input=JOptionPane.showInputDialog("How old are you?"); int age=Integer.parseInt(input); System.out.println("Hello,"+name+".Next year,you'll be"+(age+1)); System.exit(0); } }
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