JAVA的输入语句总结.doc

java的输入语句小结） 1.使用Scanner 使用时需要引入包import java.util.Scanner;首先定义Scanner对象Scanner sc = new Scanner(System.in);如果要输入整数，则 int n = sc.nextInt();String类型的，则String temp = sc.next(); 比如：import java.util.Scanner;public class Test public static void main(String args) Scanner scanner = new Scanner(System.in); int days = 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31; int month = -1; while(true) try System.out.print(请输入月份：); month = scanner.nextInt(); if(month = 1 & month = 12) break; System.out.println(* 请输入正确的月份 *); catch (Exception e) System.out.println(* 格式错误！请输入数字 *); scanner.next(); System.out.println(month + 月份有： + daysmonth - 1 + 天); 2.使用BufferedReader用前需要引入 import java.io.Reader;BufferedReader br = new BufferedReader( new InputStreamReader(System.in) );String input = br.readLine();比如：import java.io.*;public class importtext public static void main(String args) String st;int num;float fnum;trySystem.out.print(输入：);BufferedReader br=new BufferedReader(new InputStreamReader(System.in);st = br.readLine();System.out.print(输入一个数：);num = Integer.parseInt(br.readLine();System.out.print(输入一个浮点数：);fnum = Float.parseFloat(br.readLine();System.out.print(输出：+st+n);System.out.print(输出：+num+n);System.out.print(输出：+fnum+n);catch(IOException e) package com.s2;import java.io.*;public class Input public static void main(String args)throws IOException while(true) BufferedReader buf; String str; buf =new BufferedReader(new InputStreamReader(System.in); System.out.println(Input a string:); str=buf.readLine(); System.out.println(String=+str); = 应该注意的是:Java把从键盘输入的数据一律看作是字符串，因此若要从键盘输入并让系统认可是数值型数据，必须经过转换。比如：package com.s2;import java.io.*;public class Input public static void main(String args)throws IOException while(true) int num; BufferedReader buf; String str; buf =new BufferedReader(new InputStreamReader(System.in); System.out.println(Input an integer:); str=buf.readLine