package com.javabase.sss;
import java.util.Scanner;
public class Zhuang {
//判断是否是数字
public static boolean isChar(char c) {
if (c >= '0' && c <= '9') {
return true;
} else {
return false;
}
}
public static void main(String[] args) {
boolean b = false;
Scanner input = new Scanner(System.in);
System.out.print("请输入数字: ");
String str = input.nextLine();
for (int i = 0; i < str.length(); i++) {
if (!isChar(str.charAt(i))) {
b = false;
break;
}
b = true;
}
if ( b == true) {
System.out.println("是数字");
} else {
System.out.println("不是数字");
}
}
}
java中判断是否是数字
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转载自blog.csdn.net/qq_43314793/article/details/90106810
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