jAVA，

jAVA，

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class ReadFromFile {

 /**
  * 以行为单位读取文件，常用于读面向行的格式化文件
  *
  * @param fileName
  *            文件名
  */
 public static void readFileByLines(String fileName) {
  File file = new File(fileName);
  BufferedReader reader = null;
  try {
   System.out.println("以行为单位读取文件内容，一次读一整行：");
   reader = new BufferedReader(new FileReader(file));
   String tempString = null;
   int line = 1;
   // 一次读入一行，直到读入null为文件结束
   while ((tempString = reader.readLine()) != null) {
    // 显示行号
    System.out.println("line " + line + ": " + tempString);
    line++;
   }
   reader.close();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   if (reader != null) {
    try {
     reader.close();
    } catch (IOException e1) {
    }
   }
  }
 }

/**
 *
 * @param args
 */
 public static void main(String[] args) {
  String fileName = "D:/items.properties";
  ReadFromFile.readFileByLines(fileName);
 }
}

 

import java.util.Scanner;

/**
 *
 * @author Administrator
 *
 */

public class impuntNmber {

 /**
  * @param args
  */
 public static void main(String[] args) {
  // TODO Auto-generated method stub
  new impuntNmber().number();

 }

 private void number() {
  // TODO Auto-generated method stub
  System.out.println("****************************************");
  System.out.println("Welcome!  ");
  System.out.println("**************************************** ");
  System.out.println("1. BURGER ");
  System.out.println("2. DRINK ");
  System.out.println("3. SIDE MENU ");
  System.out.println("**************************************** ");
  System.out.println("Choose menu :  ");
  ChooseFunction(Inputnumber());
 }

 private void ChooseFunction(int input) {
  
  // TODO Auto-generated method stub
  System.out.println(input);
  if (input == 1) {
   System.out.println("**************************************** ");
   System.out.println("ITEMS OF BURGER  ");
   System.out.println("**************************************** ");
   System.out.println("1. Original Burger ( 2.7 Yuan )");
   System.out.println("2. Cheese Burger ( 3.2 Yuan ) ");
   System.out.println("B. Back to Main Screen ");
   System.out.println("**************************************** ");
   System.out.println("Choose menu :  ");
  }
  if (input == 2) {

  }

  else {
   System.out.println("**************************************** ");
   System.out.println("ERROR!!! : Wrong Input ");
   System.out.println("**************************************** ");
   System.out.println("1. BURGER ");
   System.out.println("2. DRINK ");
   System.out.println("3. SIDE MENU ");
   System.out.println("**************************************** ");
   System.out.println("Choose menu :  ");
  }
 }

 private int Inputnumber() {
  Scanner va = new Scanner(System.in);
  int nmber = va.nextInt();
  return nmber;
 }
}