كيف أمنع طباعة النتيجة الا اذا تم ادخل input معين(اربط بين حدثين)

بانتظار المساعدة

بانتظار المساعدة

ببساطة قبل تنفيذ حدث الزر افحص المدخلات اذا كانت فارغة ام لا

استفيد من هذا المثال

/*
 * Test.java
 *
 * Created on November 12, 2006, 8:38 PM
 */

/**
 *
 * @author  Hadi
 */
public class Test extends javax.swing.JFrame {

	/** Creates new form Test */
	public Test() {
		initComponents();
	}

	/** This method is called from within the constructor to
	 * initialize the form.
	 * WARNING: Do NOT modify this code. The content of this method is
	 * always regenerated by the Form Editor.
	 */
	private void initComponents() {
		jPanel1 = new javax.swing.JPanel();
		a = new javax.swing.JTextField();
		b = new javax.swing.JTextField();
		jButton1 = new javax.swing.JButton();

		getContentPane().setLayout(null);

		addWindowListener(new java.awt.event.WindowAdapter() {
			public void windowClosing(java.awt.event.WindowEvent evt) {
				exitForm(evt);
			}
		});

		jPanel1.setLayout(null);

		jPanel1.setBorder(new javax.swing.border.EtchedBorder());
		a.addKeyListener(new java.awt.event.KeyAdapter() {
			public void keyReleased(java.awt.event.KeyEvent evt) {
				aKeyReleased(evt);
			}
		});

		jPanel1.add(a);
		a.setBounds(80, 30, 150, 20);

		b.addKeyListener(new java.awt.event.KeyAdapter() {
			public void keyReleased(java.awt.event.KeyEvent evt) {
				bKeyReleased(evt);
			}
		});

		jPanel1.add(b);
		b.setBounds(80, 70, 150, 20);

		jButton1.setText("do action");
		jButton1.setEnabled(false);
		jPanel1.add(jButton1);
		jButton1.setBounds(111, 130, 90, 23);

		getContentPane().add(jPanel1);
		jPanel1.setBounds(10, 10, 340, 190);

		java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
		setBounds((screenSize.width-369)/2, (screenSize.height-251)/2, 369, 251);
	}

	private void bKeyReleased(java.awt.event.KeyEvent evt) {
		// TODO add your handling code here:
		if((!a.getText().equalsIgnoreCase(""))&&(!b.getText().equalsIgnoreCase(""))){

			jButton1.setEnabled(true);  
		}
		else
		  jButton1.setEnabled(false);  

	}

	private void aKeyReleased(java.awt.event.KeyEvent evt) {
		// TODO add your handling code here:
			  if((!a.getText().equalsIgnoreCase(""))&&(!b.getText().equalsIgnoreCase(""))){
		   jButton1.setEnabled(true);  

		}
			   else
					jButton1.setEnabled(false);  

	}

	/** Exit the Application */
	private void exitForm(java.awt.event.WindowEvent evt) {
		System.exit(0);
	}

	/**
	 * @param args the command line arguments
	 */
	public static void main(String args[]) {
		new Test().show();
	}

	// Variables declaration - do not modify
	private javax.swing.JTextField a;
	private javax.swing.JTextField b;
	private javax.swing.JButton jButton1;
	private javax.swing.JPanel jPanel1;
	// End of variables declaration

}