java键盘输入的问题

java键盘输入的问题

第一段，你只有read一次过，第二次，你readLine是等着的，会readLine多次 int ch = is.read(); while(ch!=-1) 和while((line=bufr.readLine())!=null) 你自己看看什么区别

文件的读写操作是会抛出 ioexception 异常的 所以在做文件读写操作的时候应该用try...catch...语句包含起来.或者在方法最后添加 throws ioexception ////////////////////////////////// import java.io.*; public class ex_data { string y; int year; string m; int month; string d; int day; ex_data() throws ioexception { //注意这里,我添加了throws ioexception inputstreamreader reader = new inputstreamreader(system.in); bufferedreader input = new bufferedreader(reader); system.out.print("enter the year:"); y = input.readline(); year = new integer(y).intvalue(); system.out.print("enter the month:"); m = input.readline(); month = new integer(m).intvalue(); system.out.print("enter the day:"); d = input.readline(); day = new integer(d).intvalue(); } void show() { system.out.println(year + "/" + month + "/" + day); system.out.println(month + "-" + day + "/" + year); system.out.println(day + "/" + month + "/" + year); } public static void main(string args[]){ ex_data obj; //这里我用try...catch子句把new ex_data包含了进来. try { obj = new ex_data(); obj.show(); } catch (ioexception e) { e.printstacktrace(); } } } ////////////////////////////////////////////// 更改你的程序后,正常编译! 或者你在 ex_data()里添加try...catch...子句.在main方法里就不用try...catch...了,如下: //////////////////////////////////////// import java.io.*; public class ex_data { string y; int year; string m; int month; string d; int day; ex_data() { inputstreamreader reader = new inputstreamreader(system.in); bufferedreader input = new bufferedreader(reader); // 为避免重复cry...catch...我把所有的语句放到了一个cry...catch...子句中 try { system.out.print("enter the year:"); y = input.readline(); year = new integer(y).intvalue(); system.out.print("enter the month:"); m = input.readline(); month = new integer(m).intvalue(); system.out.print("enter the day:"); d = input.readline(); day = new integer(d).intvalue(); } catch (ioexception e) { e.printstacktrace(); } } void show() { system.out.println(year + "/" + month + "/" + day); system.out.println(month + "-" + day + "/" + year); system.out.println(day + "/" + month + "/" + year); } public static void main(string args[]) { ex_data obj; obj = new ex_data(); obj.show(); } }