testputin.java

是一个关于JAVA的文件

//从键盘上接受一个数值，并在屏幕上输出。

import java.io.*;

public class testputin {
        
        public static void main(String [] argv) {
        
                int val = 0;
                String tmp = "";
                
                try {
                        
                        System.out.print("Please Input : "); 
                        
                        BufferedReader        br = 
                                new BufferedReader(new InputStreamReader(System.in));
                        
                        tmp = br.readLine().toString();
                        
                        if (testputin.isNumber(tmp)) {
                                val = Integer.parseInt(tmp);
                                System.out.println(val);
                        }
                        else {
                                System.out.println("No number!!!");
                        }
                }
                catch(IOException e){
                        System.out.println(e.getMessage());
                }
        }
        
        public static boolean isNumber(String s) {
                
                try {
             
                     Integer.parseInt(s);
                  }
                  catch(Exception e) {
     
                     return false;
                  }
                  
                  return true;
        }
}