How to enter statements in java

How to input statements in java: 1. Enter a single character [char c=(char)System.in.read()]; 2. Enter an integer or string [int a=cin.nextInt()] ;3. You can use the BufferedReader class for input.

How to input statements in java:

If you want to input, please add two packages

import java.util.*;
import java.io.*;

Please see the following example for inputting a single character

import java.io.*;
import java.util.*;
public class Main{
    public static void main(String[] args)throws IOException{
        char c=(char)System.in.read();
        System.out.println(c);
    }
}

Enter an integer or character (string)

import java.io.*;
import java.util.*;
public class Main{
    public static void main(String[] args)throws IOException{
        Scanner cin=new Scanner(System.in);
         
        int a=cin.nextInt();//输入一个整数
        System.out.println(a);
         
        double b=cin.nextDouble();//输入一个双精度的浮点数
        System.out.println(b);
         
        String str=cin.next();//输入一个单词，遇到分号则输入终止
        System.out.println(str);
         
        String str2=cin.nextLine();//输入一行，中间可有多个空格
        System.out.println(str2);
    }
}

You can also use the BufferedReader class to input

import java.io.*;
import java.util.*;
public class Main{
    public static void main(String[] args)throws IOException{
        BufferedReader cin=new BufferedReader(new InputStreamReader(System.in));
        String str=cin.readLine();//输入一行
        System.out.println(str);
         
        String str2=cin.readLine();
        int a=Integer.parseInt(str2);//将str2转换为int,并复制给a
        System.out.println(a);
         
        String str3=cin.readLine();
        double b=Double.parseDouble(str3);//将str3转换为double,并复制给b
        System.out.println(b);
    }
}

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