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841 Bytes
| package Integer_package; | |
| import java.util.Scanner; | |
| public class Integer_demo3 { | |
| public static void main(String[] args) { | |
| //键盘录入 | |
| Scanner sc = new Scanner(System.in); | |
| System.out.println("请输入一个字符串:"); | |
| //弊端: | |
| //当我们在使用next,nextInt,nextDouble在接收数据的时候,遇到空格,回车,制表符的时候就停止了 | |
| //键盘录入的是123 123 那么此时只能接收到空格前面的数据 | |
| //我想要的是接收一整行数据 | |
| //约定: | |
| //以后我们想要键盘录入,不管什么类型,统一使用nextLine | |
| //特点遇到回车才停止 | |
| String line = sc.nextLine(); | |
| System.out.println(line); | |
| double v = Double.parseDouble(line); | |
| System.out.println(v); | |
| } | |
| } | |