Java isDigit() - Character

Character.isDigit(chObj);

package com.java.myapp;

public class MyClass {

    public static void main(String[] args) {
         
    	char a = ' ';
    	Character b = new Character('5');
    	Character c = '\n';
    	char d = '9';
    	
    	 System.out.println(Character.isDigit(a));
    	 System.out.println(Character.isDigit(b));
    	 System.out.println(Character.isDigit(c));
    	 System.out.println(Character.isDigit(d));
        	    	
    }
	
}