TUGAS 4

Luas Lingkaran 
Form

Koding

package pkg30411046;
public class JFlingkaran extends javax.swing.JFrame {
     
    public JFlingkaran() {
        initComponents();
    }

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
       
       double bil1 = Double.parseDouble(text1.getText());
       double keliling = 2 * 3.14 * bil1;
       double luas = 3.14 * bil1 * bil1;
       text2.setText(keliling+"");
       text3.setText(luas+"");
            
    }                           

}

Luas Segitiga

Koding

 package pkg30411046;
public class JFsegitiga extends javax.swing.JFrame {
    /**
     * Creates new form JFsegitiga
     */
    public JFsegitiga() {
        initComponents();
    }

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        
       int bil1 = Integer.parseInt(text1.getText());
       int bil2 = Integer.parseInt(text2.getText());
       int bil3 = Integer.parseInt(text3.getText());
       double bl1 = Double.parseDouble(text1.getText());
       double bl2 = Double.parseDouble(text2.getText());
       int keliling = bil1 + bil2 + bil3;
       double luas = 0.5 * bil1*bil2 ;
       text4.setText(keliling+"");
       text5.setText(luas+"");
        
    }

Luas persegi

Koding

package pkg30411046;
public class JFpersegi extends javax.swing.JFrame {

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

 private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        
        int bil1 = Integer.parseInt(text1.getText());
       int keliling = 4 * bil1;
       int luas = bil1*bil1;
       text2.setText(keliling+"");
       text3.setText(luas+"");
       
    }                       
}