学习历程(部分资源来源网络)

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连接起来是："+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

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);
    }
}

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());
}
}

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("他们都是字符串\"test\"!");
}
}

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);
    }
    
}