Question

java中要从控制台输入数字的代码怎么写

Answer 1

如果要int类型，只要把double input = scanner.nextDouble();换为
int input = scanner.nextInt().同样适用于float, short byte等类型

import java.util.Scanner;

public class ABC {

public static void main(String[] args) {

double input = getInputFromConsole();

}

//接受控制台输入数字
private static double getInputFromConsole() {
Scanner scanner = new Scanner(System.in);

double input = scanner.nextDouble();

return input;
}
}

Answer 2

import java.util.*;
public class Input
{
public static int getInt(){
Scanner sc = new Scanner(System.in);
int value=0;
try{
value = sc.nextInt();
}catch(InputMismatchException e){
System.out.println("输入的不是数字");
return 0;
}catch(NoSuchElementException e){
System.out.println("没有输入操作!");
}
return value;
}
}
可以写成一个静态方法，来调用

Answer 3

方法1：scanner类中的
Scanner scanneer = new Scanner(System.in);
double intput = scanner.nextDouble();
方法2：JOptionPane调用对话框输入:
import javax.swing.*;
String intpitString = JOptionPane.showInputDialog("输入数字:");
double intput = Double.parseDouble(intputString);

Answer 4

IputStreamReader isr=new InputStreamReader(system.in);
BufferedReader br=new BufferedReader(isr);
String a=br.nextLine();//将文字以字符串的形式保存到a中