Contoh Penggunaan Fungsi for pada java dengan JFrame

/*
 * @NGATMIN
 * @2112R0558
 * STMIK HIMSYA SEMARANG
 */
import javax.swing.*;
import java.awt.*;
public class soal_3a extends JFrame {
    JTextArea tombol;
   
    public soal_3a(){
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        tombol = new JTextArea("");
        JScrollPane js = new JScrollPane(tombol);
        js.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
        js.setBounds(20, 20, 320, 230);
        getContentPane().add(js);
        getContentPane().setLayout(null);
        for(int n=0; n<100; n++){
          tombol.append(" NGATMIN | STMIK HIMSYA SEMARANG\n");
          tombol.setBackground(Color.GREEN);
          tombol.setFont(new Font("Arial Black",1,12));
     
      }
   
        this.setSize(370,300);
        this.setLocationRelativeTo(null);
        this.setResizable(false);
        this.setTitle("Soal 2 | for");
        setVisible(true);
    }
    public static void main(String []aa){
        new soal_3a();
    } 
}

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