JAVA几种数据输入

1.//用命令行参数 import java.io.*; public class add {

public static void main(String args[]) throws IOException {

int sum; try { sum =

Integer.parseInt(args[0])+Integer.parseInt(args[1]); System.out.println(\"两参数的和是:\"+sum); }

catch (Exception e) {

System.out.println(\"参数出现错误！\"); } } }

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2.//用system.in import java.io.*; public class AddInput {

public static void main(String args[]) throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int x=0,y=0; try{

System.out.println(\"请输入第一个整数:\"); x=Integer.parseInt(br.readLine()); System.out.println(\"请输入第二个整数:\"); y=Integer.parseInt(br.readLine()); System.out.println(\"它们的和是:\"+(x+y)); }

catch (Exception e) {

System.out.println(\"输入有错误，请重新运行!\"); } }

}

========================================================= 3.//用scanner//扫描输入文本 import java.io.*;

import java.util.*;// 实用工具类库java.util包 public class AddScanner {

public static void main(String args[]) throws IOException {

Scanner sc=new Scanner(System.in); int x=0,y=0; try {

System.out.println(\"请输入第一个整数:\"); x=sc.nextInt();

System.out.println(\"请输入第二个整数:\"); y=sc.nextInt();

System.out.println(\"它们的和是:\"+(x+y)); }

catch (Exception e) {

System.out.println(\"输入有错误，请重新运行!\"); } }