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import java.awt.*;
import java.awt.event.*;

public class GUIaa extends Frame {
    Button    b0 = new Button("judge!");
    Label     x0 = new Label("Type a number and press...");
    TextField t0 = new TextField();

    public GUIaa() {
        setLayout(null);
        add(t0); t0.setBounds(10, 40, 90, 30);
        add(b0); b0.setBounds(110, 40, 100, 30);
        add(x0); x0.setBounds(10, 80, 180, 30);
        b0.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent evt) {
                    int i = (new Integer(t0.getText())).intValue();
                    t0.setText("");
                    int hanteihensuu=0;
                    for (int count=2; count < i;++count){
                        if(i%count == 0)
                            hanteihensuu = 1;
                    }
                    if(hanteihensuu == 0) {
                        x0.setText(i + " is Prime");
                    } else {
                        x0.setText(i + " is not Prime");
                    }
                }
            });
    }
    public static void main(String[] args) {
        Frame win = new GUIaa();
        win.setSize(200, 150); win.setVisible(true);
        win.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent evt) {
                    System.exit(0);
                }
            });
    }
}

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TextField
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ActionEvent
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