[JAVA] JTextField e centratura

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import javax.swing.*;
import java.awt.*;

public class Matr extends javax.swing.JApplet {

    private JTextField[][] matrice;

    public void init() {
       	initComponents();
       	matrice = new JTextField[6][6];

       	matrice [0][0] = m00;
       	matrice [0][1] = m01;
       	matrice [0][2] = m02;
       	matrice [0][3] = m03;
       	matrice [0][4] = m04;
       	matrice [0][5] = m05;
       	
       	matrice [1][0] = m10;
       	matrice [1][1] = m11;
       	matrice [1][2] = m12;
       	matrice [1][3] = m13;
       	matrice [1][4] = m14;
       	matrice [1][5] = m15;
       	
       	matrice [2][0] = m20;
       	matrice [2][1] = m21;
       	matrice [2][2] = m22;
       	matrice [2][3] = m23;
       	matrice [2][4] = m24;
       	matrice [2][5] = m25;
       	
       	matrice [3][0] = m30;
       	matrice [3][1] = m31;
       	matrice [3][2] = m32;
       	matrice [3][3] = m33;
       	matrice [3][4] = m34;
       	matrice [3][5] = m35;
       	
       	matrice [4][0] = m40;
       	matrice [4][1] = m41;
       	matrice [4][2] = m42;
       	matrice [4][3] = m43;
       	matrice [4][4] = m44;
       	matrice [4][5] = m45;
       	
       	matrice [5][0] = m50;
       	matrice [5][1] = m51;
       	matrice [5][2] = m52;
       	matrice [5][3] = m53;
       	matrice [5][4] = m54;
       	matrice [5][5] = m55;
    }

    private void initComponents() {  
    	m00 = new javax.swing.JTextField();
    	m01 = new javax.swing.JTextField();
    	m02 = new javax.swing.JTextField();
    	m03 = new javax.swing.JTextField();
    	m04 = new javax.swing.JTextField();
    	m05 = new javax.swing.JTextField();
    	
    	m10 = new javax.swing.JTextField();
    	m11 = new javax.swing.JTextField();
    	m12 = new javax.swing.JTextField();
    	m13 = new javax.swing.JTextField();
    	m14 = new javax.swing.JTextField();
    	m15 = new javax.swing.JTextField();
    	
    	m20 = new javax.swing.JTextField();
    	m21 = new javax.swing.JTextField();
    	m22 = new javax.swing.JTextField();
    	m23 = new javax.swing.JTextField();
    	m24 = new javax.swing.JTextField();
    	m25 = new javax.swing.JTextField();
    	
    	m30 = new javax.swing.JTextField();
    	m31 = new javax.swing.JTextField();
    	m32 = new javax.swing.JTextField();
    	m33 = new javax.swing.JTextField();
    	m34 = new javax.swing.JTextField();
    	m35 = new javax.swing.JTextField();
    	
    	m40 = new javax.swing.JTextField();
    	m41 = new javax.swing.JTextField();
    	m42 = new javax.swing.JTextField();
    	m43 = new javax.swing.JTextField();
    	m44 = new javax.swing.JTextField();
    	m45 = new javax.swing.JTextField();

		m50 = new javax.swing.JTextField();
    	m51 = new javax.swing.JTextField();
    	m52 = new javax.swing.JTextField();
    	m53 = new javax.swing.JTextField();
    	m54 = new javax.swing.JTextField();
    	m55 = new javax.swing.JTextField();

// ----> RIGA 0  
  	
    	m00.setEditable(false);
        m00.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m00.setText("Y/X");
        m00.setBackground(Color.GREEN);
    	getContentPane().add(m00);
    	m00.setBounds(20, 20, 30, 30);
    	
    	m01.setEditable(false);
        m01.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m01.setText("1");
        m01.setBackground(Color.GREEN);
    	getContentPane().add(m01);
    	m01.setBounds(50, 20, 30, 30);
    	
    	m02.setEditable(false);
        m02.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m02.setText("2");
        m02.setBackground(Color.GREEN);
    	getContentPane().add(m02);
    	m02.setBounds(80, 20, 30, 30);
    	
    	m03.setEditable(false);
        m03.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m03.setText("3");
        m03.setBackground(Color.GREEN);
    	getContentPane().add(m03);
    	m03.setBounds(110, 20, 30, 30);
    	
    	m04.setEditable(false);
        m04.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m04.setText("4");
        m04.setBackground(Color.GREEN);
    	getContentPane().add(m04);
    	m04.setBounds(140, 20, 30, 30);
    	
    	m05.setEditable(false);
        m05.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m05.setText("5");
        m05.setBackground(Color.GREEN);
    	getContentPane().add(m05);
    	m05.setBounds(170, 20, 30, 30);

// ----> RIGA 1
    	
    	m10.setEditable(false);
        m10.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m10.setText("1");
        m10.setBackground(Color.GREEN);
    	getContentPane().add(m10);
    	m10.setBounds(20, 50, 30, 30);
    	
    	m11.setEditable(false);
        m11.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m11.setText("a");
    	getContentPane().add(m11);
    	m11.setBounds(50, 50, 30, 30);
    	
    	m12.setEditable(false);
        m12.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m12.setText("b");
    	getContentPane().add(m12);
    	m12.setBounds(80, 50, 30, 30);
    	
    	m13.setEditable(false);
        m13.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m13.setText("c");
    	getContentPane().add(m13);
    	m13.setBounds(110, 50, 30, 30);
    	
    	m14.setEditable(false);
        m14.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m14.setText("d");
    	getContentPane().add(m14);
    	m14.setBounds(140, 50, 30, 30);
    	
    	m15.setEditable(false);
        m15.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m15.setText("e");
    	getContentPane().add(m15);
    	m15.setBounds(170, 50, 30, 30);
    	
// ----> RIGA 2
    	
    	m20.setEditable(false);
        m20.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m20.setText("2");
        m20.setBackground(Color.GREEN);
    	getContentPane().add(m20);
    	m20.setBounds(20, 80, 30, 30);
    	
    	m21.setEditable(false);
        m21.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m21.setText("f");
    	getContentPane().add(m21);
    	m21.setBounds(50, 80, 30, 30);
    	
    	m22.setEditable(false);
        m22.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m22.setText("g");
    	getContentPane().add(m22);
    	m22.setBounds(80, 80, 30, 30);
    	
    	m23.setEditable(false);
        m23.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m23.setText("h");
    	getContentPane().add(m23);
    	m23.setBounds(110, 80, 30, 30);
    	
    	m24.setEditable(false);
        m24.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m24.setText("i");
    	getContentPane().add(m24);
    	m24.setBounds(140, 80, 30, 30);
    	
    	m25.setEditable(false);
        m25.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m25.setText("j");
    	getContentPane().add(m25);
    	m25.setBounds(170, 80, 30, 30);
    	
// ----> RIGA 3
    	
    	m30.setEditable(false);
        m30.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m30.setText("3");
        m30.setBackground(Color.GREEN);
    	getContentPane().add(m30);
    	m30.setBounds(20, 110, 30, 30);
    	
    	m31.setEditable(false);
        m31.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m31.setText("kq");
    	getContentPane().add(m31);
    	m31.setBounds(50, 110, 30, 30);
    	
    	m32.setEditable(false);
        m32.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m32.setText("l");
    	getContentPane().add(m32);
    	m32.setBounds(80, 110, 30, 30);
    	
    	m33.setEditable(false);
        m33.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m33.setText("m");
    	getContentPane().add(m33);
    	m33.setBounds(110, 110, 30, 30);
    	
    	m34.setEditable(false);
        m34.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m34.setText("n");
    	getContentPane().add(m34);
    	m34.setBounds(140, 110, 30, 30);
    	
    	m35.setEditable(false);
        m35.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m35.setText("o");
    	getContentPane().add(m35);
    	m35.setBounds(170, 110, 30, 30);
    	
// ----> RIGA 4
    	
    	m40.setEditable(false);
        m40.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m40.setText("4");
        m40.setBackground(Color.GREEN);
    	getContentPane().add(m40);
    	m40.setBounds(20, 140, 30, 30);
    	
    	m41.setEditable(false);
        m41.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m41.setText("p");
    	getContentPane().add(m41);
    	m41.setBounds(50, 140, 30, 30);
    	
    	m42.setEditable(false);
        m42.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m42.setText("r");
    	getContentPane().add(m42);
    	m42.setBounds(80, 140, 30, 30);
    	
    	m43.setEditable(false);
        m43.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m43.setText("s");
    	getContentPane().add(m43);
    	m43.setBounds(110, 140, 30, 30);
    	
    	m44.setEditable(false);
        m44.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m44.setText("t");
    	getContentPane().add(m44);
    	m44.setBounds(140, 140, 30, 30);
    	
    	m45.setEditable(false);
        m45.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m45.setText("u");
    	getContentPane().add(m45);
    	m45.setBounds(170, 140, 30, 30);
    	
// ----> RIGA 5

    	m50.setEditable(false);
        m50.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m50.setText("5");
        m50.setBackground(Color.GREEN);
    	getContentPane().add(m50);
    	m50.setBounds(20, 170, 30, 30);
    	
    	m51.setEditable(false);
        m51.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m51.setText("v");
    	getContentPane().add(m51);
    	m51.setBounds(50, 170, 30, 30);
    	
    	m52.setEditable(false);
        m52.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m52.setText("w");
    	getContentPane().add(m52);
    	m52.setBounds(80, 170, 30, 30);
    	
    	m53.setEditable(false);
        m53.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m53.setText("x");
    	getContentPane().add(m53);
    	m53.setBounds(110, 170, 30, 30);
    	
    	m54.setEditable(false);
        m54.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m54.setText("y");
    	getContentPane().add(m54);
    	m54.setBounds(140, 170, 30, 30);
    	
    	m55.setEditable(false);
        m55.setHorizontalAlignment(javax.swing.JTextField.CENTER);
        m55.setText("z");
    	getContentPane().add(m55);
    	m55.setBounds(170, 170, 30, 30);
    }
    
		private javax.swing.JTextField m00;
		private javax.swing.JTextField m01;
		private javax.swing.JTextField m02;
		private javax.swing.JTextField m03;
		private javax.swing.JTextField m04;
		private javax.swing.JTextField m05;
		
		private javax.swing.JTextField m10;
		private javax.swing.JTextField m11;
		private javax.swing.JTextField m12;
		private javax.swing.JTextField m13;
		private javax.swing.JTextField m14;
		private javax.swing.JTextField m15;
		
		private javax.swing.JTextField m20;
		private javax.swing.JTextField m21;
		private javax.swing.JTextField m22;
		private javax.swing.JTextField m23;
		private javax.swing.JTextField m24;
		private javax.swing.JTextField m25;
		
		private javax.swing.JTextField m30;
		private javax.swing.JTextField m31;
		private javax.swing.JTextField m32;
		private javax.swing.JTextField m33;
		private javax.swing.JTextField m34;
		private javax.swing.JTextField m35;
		
		private javax.swing.JTextField m40;
		private javax.swing.JTextField m41;
		private javax.swing.JTextField m42;
		private javax.swing.JTextField m43;
		private javax.swing.JTextField m44;
		private javax.swing.JTextField m45;
		
		private javax.swing.JTextField m50;
		private javax.swing.JTextField m51;
		private javax.swing.JTextField m52;
		private javax.swing.JTextField m53;
		private javax.swing.JTextField m54;
		private javax.swing.JTextField m55;
		
}

Tutto il codice è questo!