Thread: How to build an array and use it to check a calculation

I want to build an Array[] with the numbers 1-100;

After the program turns the String inputAmount ,into a double input, I'm going to divide input by 20 = withdrawIncrement.
How do I check withdrawIncrement through the Array[] to find a match

private class BtnHandler implements ActionListener {
 
		public void actionPerformed(ActionEvent event) {
 
			exit = "";
 
			while(accountBoolean == true && exit != null) {
 
			    if(event.getSource() == btnWithdraw) {
			    	transCount++;
				    String inputAmount = JOptionPane.showInputDialog("Enter amount to withdraw from Savings");
				    double input = Double.parseDouble(inputAmount);
 
	/////////THIS IS WHERE I WANT TO CHECK TO MAKE SURE WITHDRAWINCREMENT IS IN ARRAY[]/////////////////////    
 
                                    savingsBalance = savingsBalance - input;
				    if(savingsBalance > 0) {
				        if(transCount <= 4) {
				    	    JOptionPane.showMessageDialog(null, "Savings account balance after withdraw: " + savingsBalance, 
				    		                              "Withdraw Window", JOptionPane.PLAIN_MESSAGE);