java:控制台输入方法

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1 最简单的Scanner方法

public class Main {    public static void main(String[] args){    Scanner a=new Scanner(System.in);        int aNum=Integer.parseInt(a.nextLine());        Scanner b=new Scanner(System.in);        int bNum=Integer.parseInt(b.nextLine());        System.out.println(aNum+bNum);    }}

2 使用BufferedReader方法

public class Main {    public static void main(String[] args) throws Exception{        InputStreamReader isr = new InputStreamReader(System.in);        BufferedReader br = new BufferedReader(isr);        System.out.println("请输入第一个数");        String a1 = br.readLine();        System.out.println("请输入第二个数");        String a2 = br.readLine();        System.out.println(Float.parseFloat(a1)+Float.parseFloat(a2));   }}

3 使用try和BufferedReader方法

public class Main {    public static void main(String[] args) {        try {            InputStreamReader isr = new InputStreamReader(System.in);            BufferedReader br = new BufferedReader(isr);            System.out.println("请输入第一个数");            String a1 = br.readLine();            System.out.println("请输入第二个数");            String a2 = br.readLine();            float num1 = Float.parseFloat(a1);            float num2 = Float.parseFloat(a2);            System.out.println(num1+num2);        } catch (Exception e) {            e.printStackTrace();        }    }}

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