接收从键盘输入一个按键字符.docVIP

//接收从键盘输入一个按键字符 import java.io.*; public class CharDemo{ public static void main(String args[]) throws IOException { char c, c1, c2; //注意对比 c = (char)System.in.read(); //注意对比 c1 = (char)(c - 1); c2 = (char)(c + 1); System.out.println( c: + c); System.out.println( c1: + c1); System.out.println( c2: + c2); } } //对比以上程序 //接收从键盘输入一个按键字符 import java.io.*; public class CharDemo{ public static void main(String args[]) throws IOException { int c; //注意对比 char c1, c2; c = System.in.read(); //注意对比 c1 = (char)(c - 1); c2 = (char)(c + 1); System.out.println( c: + c); System.out.println( c1: + c1); System.out.println( c2: + c2); } } //从键盘接收数据 import java.io.*; public class InputDemo{ public static void main(String args[])throws IOException{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.print(输入一个整数); String str = br.readLine(); int i = Integer.parseInt(str); System.out.println(输入一个实数); str = br.readLine(); float f = Float.parseFloat(str); System.out.println(它们的和是 + ( i + f)); //仿照以上，如果输入的是boolean类型的true或false，该如何转换 } } 2．结合自定义异常，要求输入的年份和月份以及日期在合理范围内 import java.io.*; //定义一个异常，继承Exception class MyException extends Exception{ //可以尝试不添加 extends Exxception，看编译提示 public MyException(){ super(我的异常信息); } public MyException(String msg){ super(msg); } } class InputDate{ public InputDate(){ try{ BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); System.out.print(输入一个年份:); String str = br.readLine(); int year = Integer.parseInt(str); if((year 3000) || (year 1))throw new MyException(年份应该在1－3000之内); System.out.print(输入一个月份:); str = br.readLine(); int month = Integer.parseInt(str); if((month 12) || (month 1))throw new MyException(月份应该在1－12之内); //自行编写，根据年份和月份，对天数的判断 System.out.println(输入一个天数); }catch(My