자바 GUI 스윙(Swing) 예제

Posted on: 2018년 04월 30일 2018년 04월 30일
Categories: 강의자료, 자바

JFrame을 생성하여 사용

public class BasicOperand1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		JFrame f = new JFrame();
		f.setTitle("연산자");
		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		f.setSize(300, 600);

		f.setLayout(null);

		JTextField txtNum1 = new JTextField(20);
		txtNum1.setBounds(10, 10, 200, 25);
		f.add(txtNum1);

		JTextField txtNum2 = new JTextField(20);
		txtNum2.setBounds(10, 50, 200, 25);
		f.add(txtNum2);

		JLabel lblResult = new JLabel("결과출력");
		lblResult.setBounds(10, 90, 200, 25);
		f.add(lblResult);

		JButton btnAdd = new JButton("더하기");
		btnAdd.setBounds(10, 130, 200, 25);
		f.add(btnAdd);
		btnAdd.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				double n1 = Double.parseDouble(txtNum1.getText().toString());
				double n2 = Double.parseDouble(txtNum2.getText().toString());
				double n = n1 + n2;
				lblResult.setText(n + "");
			}
		});


		f.setVisible(true);
	}
}

public class BasicOperand1 {

public static void main(String[] args) {

// TODO Auto-generated method stub

JFrame f = new JFrame();

f.setTitle("연산자");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setSize(300, 600);

f.setLayout(null);

JTextField txtNum1 = new JTextField(20);

txtNum1.setBounds(10, 10, 200, 25);

f.add(txtNum1);

JTextField txtNum2 = new JTextField(20);

txtNum2.setBounds(10, 50, 200, 25);

f.add(txtNum2);

JLabel lblResult = new JLabel("결과출력");

lblResult.setBounds(10, 90, 200, 25);

f.add(lblResult);

JButton btnAdd = new JButton("더하기");

btnAdd.setBounds(10, 130, 200, 25);

f.add(btnAdd);

btnAdd.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

double n1 = Double.parseDouble(txtNum1.getText().toString());

double n2 = Double.parseDouble(txtNum2.getText().toString());

double n = n1 + n2;

lblResult.setText(n + "");

}

});

f.setVisible(true);

}

JFrame을 상속받아 사용

public class BasicOperand2 extends JFrame {

	public BasicOperand2() {
		this.setTitle("연산자");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(300, 600);

		this.setLayout(null);

		JTextField txtNum1 = new JTextField(20);
		txtNum1.setBounds(10, 10, 200, 25);
		this.add(txtNum1);

		JTextField txtNum2 = new JTextField(20);
		txtNum2.setBounds(10, 50, 200, 25);
		this.add(txtNum2);

		JLabel lblResult = new JLabel("결과출력");
		lblResult.setBounds(10, 90, 200, 25);
		this.add(lblResult);

		JButton btnAdd = new JButton("더하기");
		btnAdd.setBounds(10, 130, 200, 25);
		this.add(btnAdd);
		btnAdd.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				double n1 = Double.parseDouble(txtNum1.getText().toString());
				double n2 = Double.parseDouble(txtNum2.getText().toString());
				double n = n1 + n2;
				lblResult.setText(n + "");
			}
		});

		this.setVisible(true);
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new BasicOperand2();
	}
}

public class BasicOperand2 extends JFrame {

public BasicOperand2() {

this.setTitle("연산자");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setSize(300, 600);

this.setLayout(null);

JTextField txtNum1 = new JTextField(20);

txtNum1.setBounds(10, 10, 200, 25);

this.add(txtNum1);

JTextField txtNum2 = new JTextField(20);

txtNum2.setBounds(10, 50, 200, 25);

this.add(txtNum2);

JLabel lblResult = new JLabel("결과출력");

lblResult.setBounds(10, 90, 200, 25);

this.add(lblResult);

JButton btnAdd = new JButton("더하기");

btnAdd.setBounds(10, 130, 200, 25);

this.add(btnAdd);

btnAdd.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

double n1 = Double.parseDouble(txtNum1.getText().toString());

double n2 = Double.parseDouble(txtNum2.getText().toString());

double n = n1 + n2;

lblResult.setText(n + "");

}

});

this.setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new BasicOperand2();

}

ActionListener를 별도로 만들어 사용

public class BasicOperand3 extends JFrame {
	JTextField txtNum1;
	JTextField txtNum2;
	JLabel lblResult;

	ActionListener actionListener = new ActionListener() {

		@Override
		public void actionPerformed(ActionEvent e) {
			// TODO Auto-generated method stub

			double n1 = Double.parseDouble(txtNum1.getText().toString());
			double n2 = Double.parseDouble(txtNum2.getText().toString());
			double n = 0;

			System.out.println(e.getActionCommand());
			switch(e.getActionCommand()) {
			case "더하기" :
				n = n1 + n2;
				break;
			}
			lblResult.setText(n + "");

		}
	};

	public BasicOperand3() {
		this.setTitle("연산자");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(300, 600);

		this.setLayout(null);

		txtNum1 = new JTextField(20);
		txtNum1.setBounds(10, 10, 200, 25);
		this.add(txtNum1);

		txtNum2 = new JTextField(20);
		txtNum2.setBounds(10, 50, 200, 25);
		this.add(txtNum2);

		lblResult = new JLabel("결과출력");
		lblResult.setBounds(10, 90, 200, 25);
		this.add(lblResult);

		JButton btnAdd = new JButton("더하기");
		btnAdd.setBounds(10, 130, 200, 25);
		this.add(btnAdd);
		btnAdd.addActionListener(actionListener);

		this.setVisible(true);
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new BasicOperand3();
	}
}

public class BasicOperand3 extends JFrame {

JTextField txtNum1;

JTextField txtNum2;

JLabel lblResult;

ActionListener actionListener = new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

double n1 = Double.parseDouble(txtNum1.getText().toString());

double n2 = Double.parseDouble(txtNum2.getText().toString());

double n = 0;

System.out.println(e.getActionCommand());

switch(e.getActionCommand()) {

case "더하기" :

n = n1 + n2;

break;

}

lblResult.setText(n + "");

}

};

public BasicOperand3() {

this.setTitle("연산자");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setSize(300, 600);

this.setLayout(null);

txtNum1 = new JTextField(20);

txtNum1.setBounds(10, 10, 200, 25);

this.add(txtNum1);

txtNum2 = new JTextField(20);

txtNum2.setBounds(10, 50, 200, 25);

this.add(txtNum2);

lblResult = new JLabel("결과출력");

lblResult.setBounds(10, 90, 200, 25);

this.add(lblResult);

JButton btnAdd = new JButton("더하기");

btnAdd.setBounds(10, 130, 200, 25);

this.add(btnAdd);

btnAdd.addActionListener(actionListener);

this.setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new BasicOperand3();

}

ActionListener를 상속받아 사용

public class BasicOperand4 extends JFrame implements ActionListener{
	JTextField txtNum1;
	JTextField txtNum2;
	JLabel lblResult;

	public BasicOperand4() {
		this.setTitle("연산자");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(300, 600);

		this.setLayout(null);

		txtNum1 = new JTextField(20);
		txtNum1.setBounds(10, 10, 200, 25);
		this.add(txtNum1);

		txtNum2 = new JTextField(20);
		txtNum2.setBounds(10, 50, 200, 25);
		this.add(txtNum2);

		lblResult = new JLabel("결과출력");
		lblResult.setBounds(10, 90, 200, 25);
		this.add(lblResult);

		JButton btnAdd = new JButton("더하기");
		btnAdd.setBounds(10, 130, 200, 25);
		this.add(btnAdd);
		btnAdd.addActionListener(this);

		this.setVisible(true);
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new BasicOperand4();
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub

		double n1 = Double.parseDouble(txtNum1.getText().toString());
		double n2 = Double.parseDouble(txtNum2.getText().toString());
		double n = 0;

		System.out.println(e.getActionCommand());
		switch(e.getActionCommand()) {
		case "더하기" :
			n = n1 + n2;
			break;
		}
		lblResult.setText(n + "");
	}
}

public class BasicOperand4 extends JFrame implements ActionListener{

JTextField txtNum1;

JTextField txtNum2;

JLabel lblResult;

public BasicOperand4() {

this.setTitle("연산자");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setSize(300, 600);

this.setLayout(null);

txtNum1 = new JTextField(20);

txtNum1.setBounds(10, 10, 200, 25);

this.add(txtNum1);

txtNum2 = new JTextField(20);

txtNum2.setBounds(10, 50, 200, 25);

this.add(txtNum2);

lblResult = new JLabel("결과출력");

lblResult.setBounds(10, 90, 200, 25);

this.add(lblResult);

JButton btnAdd = new JButton("더하기");

btnAdd.setBounds(10, 130, 200, 25);

this.add(btnAdd);

btnAdd.addActionListener(this);

this.setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new BasicOperand4();

}

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

double n1 = Double.parseDouble(txtNum1.getText().toString());

double n2 = Double.parseDouble(txtNum2.getText().toString());

double n = 0;

System.out.println(e.getActionCommand());

switch(e.getActionCommand()) {

case "더하기" :

n = n1 + n2;

break;

}

lblResult.setText(n + "");

}

반복문 사용해서 버튼 생성 코드 줄이기

public class BasicOperand5 extends JFrame {

	JTextField t1;
	JTextField t2;
	JLabel L1;

	String[] op = new String[] { "+", "-", "*", "/", "%", ">>", "<<", ">>>", "&", "|", "^", "~"};

	ActionListener actionListener = new ActionListener() {

		@Override
		public void actionPerformed(ActionEvent e) {
			int a = Integer.parseInt(t1.getText());
			int b = Integer.parseInt(t2.getText());
			int c = 0;

			switch (e.getActionCommand()) {
			case "+":
				c = a + b;
				break;
			case "-":
				c = a - b;
				break;
			case "*":
				c = a * b;
				break;
			case "/":
				c = a / b;
				break;
			case "%":
				c = a % b;
				break;
			case ">>":
				c = a >> b;
				break;
			case "<<":
				c = a << b;
				break;
			case ">>>":
				c = a >>> b;
				break;
			case "&":
				c = a & b;
				break;
			case "|":
				c = a | b;
				break;
			case "^":
				c = a ^ b;
				break;
			case "~":
				c = ~a;
				break;
			}

			L1.setText("" + c);
		}
	};

	public BasicOperand5() {
		this.setTitle("연산자");
		this.setSize(300, 600);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		this.setLayout(null);

		t1 = new JTextField(20);
		t1.setBounds(10, 10, 200, 25);
		this.add(t1);

		t2 = new JTextField(20);
		t2.setBounds(10, 40, 200, 25);
		this.add(t2);

		L1 = new JLabel("0");
		L1.setBounds(10, 70, 200, 25);
		this.add(L1);

		JButton btns[] = new JButton[op.length];
		for (int i = 0; i < op.length; i++) {
			btns[i] = new JButton();
			btns[i].setBounds(10, i*30 + 100, 200, 25);
			btns[i].setText(op[i]);
			this.add(btns[i]);
			btns[i].addActionListener(actionListener);
		}

		this.setVisible(true);
	}

	public static void main(String[] args) {
		new BasicOperand5();
	}
}

public class BasicOperand5 extends JFrame {

JTextField t1;

JTextField t2;

JLabel L1;

String[] op = new String[] { "+", "-", "*", "/", "%", ">>", "<<", ">>>", "&", "|", "^", "~"};

ActionListener actionListener = new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

int a = Integer.parseInt(t1.getText());

int b = Integer.parseInt(t2.getText());

int c = 0;

switch (e.getActionCommand()) {

case "+":

c = a + b;

break;

case "-":

c = a - b;

break;

case "*":

c = a * b;

break;

case "/":

c = a / b;

break;

case "%":

c = a % b;

break;

case ">>":

c = a >> b;

break;

case "<<":

c = a << b;

break;

case ">>>":

c = a >>> b;

break;

case "&":

c = a & b;

break;

case "|":

c = a | b;

break;

case "^":

c = a ^ b;

break;

case "~":

c = ~a;

break;

}

L1.setText("" + c);

}

};

public BasicOperand5() {

this.setTitle("연산자");

this.setSize(300, 600);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setLayout(null);

t1 = new JTextField(20);

t1.setBounds(10, 10, 200, 25);

this.add(t1);

t2 = new JTextField(20);

t2.setBounds(10, 40, 200, 25);

this.add(t2);

L1 = new JLabel("0");

L1.setBounds(10, 70, 200, 25);

this.add(L1);

JButton btns[] = new JButton[op.length];

for (int i = 0; i < op.length; i++) {

btns[i] = new JButton();

btns[i].setBounds(10, i*30 + 100, 200, 25);

btns[i].setText(op[i]);

this.add(btns[i]);

btns[i].addActionListener(actionListener);

}

this.setVisible(true);

}

public static void main(String[] args) {

new BasicOperand5();

}

whan0623

517