Scanner 與 BufferReader的選擇

今天在測試ant的時候，寫了以下代碼：

HelloWorld.java//

package com.laolang.hello;


import java.util.Scanner;

import com.laolang.stu.Student;

public class HelloWorld {
	public static void main(String[] args) {
		Scanner input = new Scanner( System.in );
		
		Student stu = null;
		int id = 0;
		String name = null;
		int age = 0;
		String sex = null;
		

		
        System.out.print("輸入學號：");
        id = Integer.parseInt( input.nextLine() );
        
        System.out.print("輸入姓名：");
        name = input.nextLine();
        
        System.out.print("輸入年齡：");
        age = Integer.parseInt( input.nextLine() );
        
        System.out.print("輸入性別：");
        sex = input.next();
		
		stu = new Student( id, name, age, sex );
		
		System.out.println("student:");
		System.out.println(stu);
		
		
		
		
		System.out.println("Hello World!");
		System.out.println("小代碼！");
		
		input.close();
	}

}

 Student.java//

package com.laolang.stu;

public class Student {

	public Student() {
		super();
	}

	public Student(int stuId, String stuName, int stuAge, String stuSex) {
		super();
		this.stuId = stuId;
		this.stuName = stuName;
		this.stuAge = stuAge;
		this.stuSex = stuSex;
	}

	@Override
	public String toString() {
		return "Student [stuId=" + stuId + ", stuName=" + stuName
				+ ", stuAge=" + stuAge + ", stuSex=" + stuSex
				+ "]";
	}

	public int getStuId() {
		return stuId;
	}

	public void setStuId(int stuId) {
		this.stuId = stuId;
	}

	public String getStuName() {
		return stuName;
	}

	public void setStuName(String stuName) {
		this.stuName = stuName;
	}

	public int getStuAge() {
		return stuAge;
	}

	public void setStuAge(int stuAge) {
		this.stuAge = stuAge;
	}

	public String getStuSex() {
		return stuSex;
	}

	public void setStuSex(String stuSex) {
		this.stuSex = stuSex;
	}

	private int stuId;
	private String stuName;
	private int stuAge;
	private String stuSex;

}

而後運行結果：

run:
     [java] 輸入學號：
1001
     [java] 輸入姓名：
     [java] 輸入年齡：
tian
     [java] Exception in thread "main" java.util.InputMismatchException
     [java] 	at java.util.Scanner.throwFor(Scanner.java:909)
     [java] 	at java.util.Scanner.next(Scanner.java:1530)
     [java] 	at java.util.Scanner.nextInt(Scanner.java:2160)
     [java] 	at java.util.Scanner.nextInt(Scanner.java:2119)
     [java] 	at com.laolang.hello.HelloWorld.main(HelloWorld.java:23)

BUILD FAILED

因而百度之，在CSDN上看到了能夠用BufferReader來讀取，通過測試，沒有問題：

使用BufferReader以後的HelloWorld.java//

package com.laolang.hello;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import com.laolang.stu.Student;

public class HelloWorld {
	public static void main(String[] args) {
		BufferedReader br = new BufferedReader(new InputStreamReader(
				System.in));
		Student stu = null;
		int id = 0;
		String name = null;
		int age = 0;
		String sex = null;

		try {
			System.out.print("輸入學號：");
			id = Integer.parseInt(br.readLine());
			System.out.print("輸入姓名：");
			name = br.readLine();
			System.out.print("輸入年齡：");
			age = Integer.parseInt(br.readLine());
			System.out.print("輸入性別：");
			sex = br.readLine();
		} catch (NumberFormatException | IOException e) {
			e.printStackTrace();
		}

		stu = new Student(id, name, age, sex);

		System.out.println("student:");
		System.out.println(stu);

		System.out.println("Hello World!");
		System.out.println("小代碼！");

	}

}

使用ant運行效果：

run:
1001
小代碼
23
男
     [java] 輸入學號：輸入姓名：輸入年齡：輸入性別：student:
     [java] Student [stuId=1001, stuName=小代碼, stuAge=23, stuSex=男]
     [java] Hello World!
     [java] 小代碼！

BUILD SUCCESSFUL
Total time: 12 seconds

使用java命令運行效果：

laolang@laolang:~/code/ant/li/stu/classes$ java com.laolang.hello.HelloWorld
輸入學號：1001
輸入姓名：tianya
輸入年齡：23
輸入性別：nan
student:
Student [stuId=1001, stuName=tianya, stuAge=23, stuSex=nan]
Hello World!
小代碼！

問題：

使用ant運行的時候雖然能夠正常輸入，可是沒有輸入，而後使用java命令就沒有問題，看來仍是應該在ant中執行shell下的 java.com.xx.xx.XX才能夠