Java determines whether it is a decimal

You can convert the number into a String, and then determine whether there is a decimal point in it. If there is, it is a decimal. If not, it is not a decimal.

public class JudgeNumber {
     
   public static boolean judgeIsDecimal(String num){
         
        boolean isdecimal = false;
         
        if (num.contains(".")) {
             
             isdecimal=true;
              
        }
         
        return isdecimal;
         
    }
     
    public static void main(String[] args) {  //测试的main方法
         
        int num1 = 34;
         
        double num2=67.8;
         
        boolean is1 = judgeIsDecimal(String.valueOf(num1));
         
        boolean is2=judgeIsDecimal(String.valueOf(num2));
         
        System.out.println(is1);//fasle
         
        System.out.println(is2);//true
         
    }
     
}

contains(), this method is to determine whether there are substrings in the string. Returns true if there is, false if not.

For more java knowledge, please pay attention to java basic tutorial.

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