import java.io.*;public class LineIn{
public static void main(String[] args) throws IOException{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("input 3 number>");
String line = in.readLine();
int x = Integer.parseInt(line);
line = in.readLine();
int y = Integer.parseInt(line);
line = in.readLine();
int z = Integer.parseInt(line);
System.out.println(x+y+z);
}
}
public static void main(String[] args) throws IOException{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("input 3 number>");
String line = in.readLine();
int x = Integer.parseInt(line);
line = in.readLine();
int y = Integer.parseInt(line);
line = in.readLine();
int z = Integer.parseInt(line);
System.out.println(x+y+z);
}
}
public static void main(String[] args){
if (args.length != 3)
System.out.println("usage: ArgsIn x y z");
int x = Integer.parseInt(args[0]);
int y = Integer.parseInt(args[1]);
int z = Integer.parseInt(args[2]);
System.out.println(x+y+z);
}
}
......
if (args.length == 3){
//应该是等于3才往下走
System.out.println("usage: ArgsIn x y z");
int x = Integer.parseInt(args[0]);
int y = Integer.parseInt(args[1]);
int z = Integer.parseInt(args[2]);
System.out.println(x+y+z);
}
....
while (true)
{
System.out.print("Please input 3 numbers: ");
try
{
String num1 = in.readLine();
int number1=Integer.parseInt(num1);
String num2 = in.readLine();
int number2=Integer.parseInt(num2);
String num3 = in.readLine();
int number3=Integer.parseInt(num3);
System.out.println(number1+number2+number3);
if (line.equals("N")||line.equals("n"))
{
break;
}
catch(Exception e)
{
System.out.println(e);
}
}
//will terminate abnormally.
if (args.length > 3) { System.out.println("usage: ArgsIn x y z");
System.exit(-1);
}
// if the Line parameters is less than three. The program
// will terminate.
try { int x = Integer.parseInt(args[0]);
int y = Integer.parseInt(args[1]);
int z = Integer.parseInt(args[2]); System.out.println(x+y+z);
} catch (Exception e) {
System.out.println("usage: ArgsIn x y z");
}
} }