java基本输入输出练习

import java.io.*;
import java.util.*;
public class helloWorld {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        char c = ‘3‘;
        System.out.print("hello world,please read in a character:");
        try{
            //只能读取输入的一个字母
            c=(char)System.in.read();
        }catch(IOException e){}
        System.out.println("entered:" + c);        
        String s = "";
        System.out.println("please read in a line:");
        //读取输入的一行
        //BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        Scanner in = new Scanner(System.in);
        s = in.next();
        System.out.println("entered" + s);        
        }
}

        int test;
        Scanner sc = new Scanner(System.in);
        test = sc.nextInt();
        System.out.println("have entered a int：" + test);
        double test1;
        Scanner sc1 = new Scanner(System.in);
        test1 = sc1.nextDouble();
        System.out.println("have entered a double：" + test1);

    Scanner s = new Scanner("123 asdf sd 45 789 sdf asdfl,sdf.sdfl,asdf    ......asdfkl    las"); 
    //s.useDelimiter(" |,|\\."); 
    while (s.hasNext()) { 
        System.out.println(s.next()); 
    }        

        public static void main(String[] args) throws FileNotFoundException { 
                InputStream in = new FileInputStream(new File("C:\\AutoSubmit.java")); 
                Scanner s = new Scanner(in); 
                while(s.hasNextLine()){ 
                        System.out.println(s.nextLine()); 
                } 
        }