Java Basic(87)-equal & equalsIgnoreCase

public class apples{

public static void main(String[] args){

String a = "apples";

String b = "bucky";

String c = "BUCKY";

System.out.println(a.length());

if(a.equals("apples")){ →比較字符串

System.out.println("it equals apples!");

}

if(b.equalsIgnoreCase(c)){ →這是忽略大小寫

System.out.println("bucky match");

}

}

}

這是運行時的結果:

6

it equals apples!

bucky match

Java Basic(86)-Drawing More Stuff

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Peach extends JPanel{

public void paintComponent (Graphics g){

super.paintComponent(g);

this.setBackground(Color.WHITE);

g.setColor(Color.BLUE);

g.drawLine(10, 25, 200, 45);

g.setColor(Color.RED);

g.drawRect(10, 55, 100, 30);

g.setColor(Color.GREEN);

g.fillOval(10, 95, 100, 30);

g.setColor(Color.ORANGE);

g.fill3DRect(10,160,100,50, true);

}

}

import javax.swing.*;

import java.awt.*;

public class apples{

public static void main(String[] args){

JFrame f = new JFrame("Title");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Peach p = new Peach();

p.setBackground(Color.WHITE);

f.add(p);

f.setSize(500,270);

f.setVisible(true);

}

Java Basic(85)-JcolorChooser

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Peach extends JFrame{

private JButton b;

private Color color = (Color.WHITE);

private JPanel panel;

public Peach(){

super("the title");

panel = new JPanel();

panel.setBackground(color);

b = new JButton("Choose a color");

b.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

color=JColorChooser.showDialog(null,"Pick you color",color);

if(color==null)

color=(Color.WHITE);

panel.setBackground(color);

}

}

);

add(panel,BorderLayout.CENTER);

add(b, BorderLayout.SOUTH);

setSize(425,150);

setVisible(true);

}

}

import javax.swing.*;

public class apples{

public static void main(String[] args){

Peach p = new Peach();

p.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

Java Basic(84)-Drawing Graphics

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Peach extends JPanel{

public void paintComponent(Graphics g){ →設置圖形（內置）

super.paintComponent(g);

this.setBackground(Color.WHITE);

g.setColor(Color.BLUE); →第一個矩形

g.fillRect(25, 25, 100, 30); →x和y 寬度和高度

g.setColor(new Color(190,81,215)); →第二個矩形

g.fillRect(25, 65, 100, 30);

g.setColor(Color.RED); →可以繪製文字

g.drawString("This is some Text", 25, 120);

}

}

import javax.swing.*;

public class bucky {

public static void main(String[] args){

JFrame f = new JFrame("Title");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Peach p = new Peach();

f.add(p);

f.setSize(400,250);

f.setVisible(true);

}

}

Java Basic(83)-FlowLayout

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Layout extends JFrame{

private JButton lb;

private JButton cb;

private JButton rb;

private FlowLayout layout;

private Container container;

public Layout(){

super("the title");

layout = new FlowLayout();

container = getContentPane();

setLayout(layout);

/ /左的東西在這裡

lb = new JButton("left");

add(lb);

lb.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

layout.setAlignment(FlowLayout.LEFT);

layout.layoutContainer(container);

}

}

);

/ /中心的東西在這裡

cb = new JButton("center");

add(cb);

cb.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

layout.setAlignment(FlowLayout.CENTER);

layout.layoutContainer(container);

}

}

);

//右的東西在這裡

rb = new JButton("right");

add(rb);

rb.addActionListener(

new ActionListener(){

public void actionPerformed(ActionEvent event){

layout.setAlignment(FlowLayout.RIGHT);

layout.layoutContainer(container);

}

}

);

}

}

import javax.swing.*;

public class bucky {

public static void main(String[] args){

Layout l = new Layout();

l.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

l.setSize(300,100);

l.setVisible(true);

}

}