package java0915_gui; import java.awt.BorderLayout; import java.awt.Button; import java.awt.Frame; import java.awt.Panel; import java.awt.TextArea; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; // Button -> click -> ActionEvent -> ActionListener // TextField -> Enter -> ActionEvent -> ActionListener class TextInput extends Frame implements ActionListener { TextField inputTxt; Button clickBtn; TextArea multiTra; Panel pn; public TextInput() { inputTxt = new TextField(20); clickBtn = new Button("input"); pn = new Panel(); pn.add(inputTxt); pn.add(clickBtn); multiTra = new TextArea(10, 10); // TextArea에서 편집 불가능 multiTra.setEditable(false); this.add(pn, BorderLayout.NORTH); this.add(multiTra, BorderLayout.CENTER); // Button에 ActionListener 연결 clickBtn.addActionListener(this); // TextField에 ActionListener 연결 inputTxt.addActionListener(this); setSize(300, 200); setVisible(true); this.addWindowListener(new WindowAdapter() { @Override public void windowClosing(WindowEvent e) { System.exit(0); } }); } @Override public void actionPerformed(ActionEvent e) { // TextField에 입력된 문자열을 리턴한다. String stn = inputTxt.getText(); if (stn.length() == 0) { inputTxt.requestFocus(); return; } // TextArea에 TextField에 입력된 문자열을 추가한다. multiTra.append(stn + "\r\n"); // TextField를 초기화한다. inputTxt.setText(""); // TextField로 포커스를 이동한다. inputTxt.requestFocus(); } } public class Java217_gui { public static void main(String[] args) { new TextInput(); } }