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import java.awt.*;
import java.awt.event.*; //-------------------------------------------- (a)
public class GUIaa extends Frame { //---------------------------------- (b)
Button b0 = new Button("Even/Odd?"); //
Label x0 = new Label("Type a number and press..."); //------------ (c)
TextField t0 = new TextField(); //
public GUIaa() {
setLayout(null); //--------------------------------- (d)
add(t0); t0.setBounds(10, 40, 90, 30); //----------------------- (e)
add(b0); b0.setBounds(110, 40, 80, 30); //----------------------- (f)
add(x0); x0.setBounds(10, 80, 180, 30); //----------------------- (g)
b0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) { //------------- (h)
int i = (new Integer(t0.getText())).intValue(); //-------- (i)
t0.setText("");
if(i % 2 == 0) {
x0.setText(i + " is Even"); //----------------------- (j)
} else {
x0.setText(i + " is Odd"); //----------------------- (k)
}
}
});
}
public static void main(String[] args) {
Frame win = new GUIaa();
win.setSize(200, 150); win.setVisible(true); //------------------ (l)
win.addWindowListener(new WindowAdapter() { //------------------ (m)
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
}
}
(a)-GUI関係のパッケージクラス群をインポート (b)-Frameクラスの継承 (c)-インスタンス変数としてボタン、表示欄、入力欄を生成・初期化 (d)-部品の自動配置機能をoffにする (e)-入力欄の貼り付け(左上隅のx/y座標、幅、高さ） (f)-ボタンの貼り付け (g)-表示欄の張り付け (h)-ボタンが押された時の動作 (i)-変数iを設定 (j)-iが２で割り切れるなら"i is Even"と表示 (k)-それ以外なら"i is Odd"と表示 (l)-ウィンドウのサイズディスプレイへ表示 (m)-ウィンドウを閉じる(終了する)動作
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import java.awt.*;
import java.awt.event.*; //---------------------------- (a)
public class ColorRGBa extends Frame { //---------------------------- (b)
Button b0 = new Button("Display"); //---------------------------- (c)
Label[] la = new Label[]{new Label ("Red"), //---------------------------- (d)
new Label ("Green"),
new Label ("Blue") };
TextField[] ta = new TextField[]{new TextField(), //---------------------------- (e)
new TextField();
new TextField()};
Label x0 = new Label("Input RGB values [0<-->255]"); //---------------------------- (f)
public ColorRGBa() { //---------- (g)
setLayout(null); //---------- (h)
for(int i = 0; i < la.length; i++) {
add(la[i]); la[i].setBounds(10, 40 + i*40, 60, 30); //---------- (i)
add(ta[i]); ta[i].setBounds(80, 40 + i*40, 60, 30); //---------- (j)
}
add(b0); b0.setBounds(10, 160, 80, 30); //---------- (k)
add(x0); x0.setBounds(10, 200, 220, 40); //---------- (l)
b0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try { //---------- (m)
x0.setBackground(new Color( //---------- (n)
(new Integer(ta[0].getText())).intValue(),
(new Integer(ta[1].getText())).intValue(),
(new Integer(ta[2].getText())).intValue()));
} catch(Exception ex) { x0.setText(ex.toString()); } //---------- (o)
}
});
}
public static void main(String[] args) {
Frame win = new ColorRGBa();
win.setSize(240, 280); win.setVisible(true); //---------- (p)
win.addWindowListener(new WindowAdapter() { //---------- (q)
public void windowClosing(WindowEvent evt) {
System.exit(0); //---------- (r)
}
});
}
}
}
(a)-GUI関係のパッケージクラス群をインポート (b)-Frameクラスの継承 (c)-インスタンス変数としてボタンを生成・初期化 (d)-表示欄を生成・初期化 (e)-入力欄を生成・初期化 (f)-表示欄を生成・初期化 (g)-コンストラクタでウィンドウの初期化 (h)-部品の自動配置機能をoffにする (i)-表示欄の張り付け (j)-入力欄の張り付け (k)-ボタン欄の張り付け (l)-表示欄の貼り付け (m)-tryで例外を検査 (n)-色の設定 (o)-数字以外が入力されるとエラーが起きる (p)-ウィンドウのサイズディスプレイへ表示 (q)-ウィンドウを閉じる動作 (r)-ウィンドウを閉じるとシステム終了
Javaでは、プログラム実行時のエラー（例外）が発生した場合に「例外処理」という機能で処理する。
try { // 例外を検出する文をここに書く } catch (例外のタイプ1 変数名) { // 例外のタイプ1が発生したとき処理する文をここに書く } catch (例外のタイプ2 変数名) { // 例外のタイプ2が発生したとき処理する文をここに書く } ・ ・ ・ catch (例外のタイプn 変数名) { // 例外のタイプnが発生したとき処理する文をここに書く } finally { // 例外発生の有無にかかわらず必ず実行する文をここに書く }
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import java.awt.*;
import java.awt.event.*;
public class GUICF extends Frame{
Button b0 = new Button("C to F");
Button b1 = new Button("F to C");
Label x0 = new Label("Result");
Label x1 = new Label("");
TextField t0 = new TextField("");
public GUICF(){
setLayout(null);
add(x0); x0.setBounds(90, 50, 50, 10);
add(x1); x1.setBounds(140, 50, 100, 10);
add(t0); t0.setBounds(20, 50, 60, 20);
add(b0); b0.setBounds(10, 100, 100, 30);
add(b1); b1.setBounds(110,100, 100, 30);
b0.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
try{
int i = (new Integer(t0.getText())).intValue();
i = (int)(1.8 * i + 32);
x1.setText(i + " F");
}catch(NumberFormatException evn){
x1.setText("Error!! Put in a number");
}
}
});
b1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt) {
try{
int j = (new Integer(t0.getText())).intValue();
j = (int)((j - 32)/1.8);
x1.setText(j + " C");
}catch(NumberFormatException evn){
x1.setText("Error!! Put in a number");
}
}
});
}
public static void main(String[] args){
Frame win = new GUICF();
win.setSize(210,200);
win.setVisible(true);
win.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent evt){
System.exit(0);
}
});
}
}
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import java.awt.*;
import java.awt.event.*;
public class GUI extends Frame {
Button ba = new Button("+");
Button bb = new Button("-");
Button bc = new Button("x");
Button bd = new Button("/");
Button be = new Button("%");
Button bf = new Button("=");
Button bg = new Button("Clear");
Button b0 = new Button("0");
Button b1 = new Button("1");
Button b2 = new Button("2");
Button b3 = new Button("3");
Button b4 = new Button("4");
Button b5 = new Button("5");
Button b6 = new Button("6");
Button b7 = new Button("7");
Button b8 = new Button("8");
Button b9 = new Button("9");
Button b10= new Button("00");
Label x0 = new Label("SisokuEnzan");
Label x1 = new Label("Result!");
Label xx = new Label("");
TextField t0 = new TextField("0");
public GUI() {
setLayout(null);
add(x0); x0.setBounds(10,30,80,30);
add(x1); x1.setBounds(90,30,80,30);
add(t0); t0.setBounds(180,30,100,30);
add(ba); ba.setBounds(220,230,80,30);
add(bb); bb.setBounds(220,190,80,30);
add(bc); bc.setBounds(220,150,80,30);
add(bd); bd.setBounds(220,110,80,30);
add(be); be.setBounds(220,70,80,30);
add(bf); bf.setBounds(160,230,60,30);
add(bg); bg.setBounds(40,70,180,30);
add(b0); b0.setBounds(40,230,60,30);
add(b1); b1.setBounds(40,190,60,30);
add(b2); b2.setBounds(100,190,60,30);
add(b3); b3.setBounds(160,190,60,30);
add(b4); b4.setBounds(40,150,60,30);
add(b5); b5.setBounds(100,150,60,30);
add(b6); b6.setBounds(160,150,60,30);
add(b7); b7.setBounds(40,110,60,30);
add(b8); b8.setBounds(100,110,60,30);
add(b9); b9.setBounds(160,110,60,30);
add(b10); b10.setBounds(100,230,60,30);
ba.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
x0.setText(" + ");
x1.setText(t0.getText());
t0.setText("0");
xx.setText("a");
}
});
bb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
x0.setText(" - ");
x1.setText(t0.getText());
t0.setText("0");
xx.setText("b");
}
});
bc.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
x0.setText(" x ");
x1.setText(t0.getText());
t0.setText("0");
xx.setText("c");
}
});
bd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
x0.setText(" / ");
x1.setText(t0.getText());
t0.setText("0");
xx.setText("d");
}
});
be.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
x0.setText(" % ");
x1.setText(t0.getText());
t0.setText("0");
xx.setText("e");
}
});
bf.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(x1.getText());
int j = Integer.parseInt(t0.getText());
String S = xx.getText();
if(S == "a"){
int sum = i + j;
x0.setText("add:");
String s = Integer.toString(sum);
x1.setText(s);
}
else if(S == "b"){
int sum = i - j;
x0.setText("substract:");
String s = Integer.toString(sum);
x1.setText(s);}
else if(S == "c"){
int sum = i * j;
x0.setText("multiply:");
String s = Integer.toString(sum);
x1.setText(s);
}
else if(S == "d"){
int sum = i / j;
x0.setText("divide:");
String s = Integer.toString(sum);
x1.setText(s);
}
else if(S == "e"){
int sum = i % j;
x0.setText("surplus:");
String s = Integer.toString(sum);
x1.setText(s);
}
else {
String s = Integer.toString(i);
t0.setText(s);
}
}
});
bg.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
t0.setText("0");
x0.setText("KEISAN");
x1.setText("SHITE!");
}
});
b0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+1;
String s = Integer.toString(sum);
t0.setText(s);
}
b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+2;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+3;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+4;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+5;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+6;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+7;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+8;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*10+9;
String s = Integer.toString(sum);
t0.setText(s);
}
});
b10.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
int i = Integer.parseInt(t0.getText());
int sum = i*100;
String s = Integer.toString(sum);
t0.setText(s);
}
});
}
public static void main(String[] args) {
Frame win = new GUI();
win.setSize(330,300);
win.setVisible(true);
win.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
}
}
５の課題が特に疲れました。
参考文献