check if string is digit code example

Example 1: java test if a string is a int

public static boolean isInt(String str) {
	
  	try {
      	@SuppressWarnings("unused")
    	int x = Integer.parseInt(str);
      	return true; //String is an Integer
	} catch (NumberFormatException e) {
    	return false; //String is not an Integer
	}
  	
}

Example 2: java check if string is number

try {
    int n = Integer.parseInt(str);
} catch (NumberFormatException e) {
    // str is not a number
}

Example 3: check if the given string is a number

//Add this to your code and call
static private boolean isMyNumber(String s){
        try{
            Integer.parseInt(s);
            return true;
        }catch (Exception e){
            return false;
        }
    }

Example 4: how to check a number in string

To find whether a given string contains a number,
convert it to a character array and find whether 
each character in the array is a digit using the isDigit() 
method of the Character class

Example 5: isnumber java

// find value is number or not in java..
// if the value is number output is true 
// if the value is not a number then output is false.. 


public class Test {

   public static void main(String args[]) {
      System.out.println(Character.isDigit('c')); // false 
      System.out.println(Character.isDigit('5')); // true
   }
}