Java GUI上的滚动条
如何将垂直滚动条添加到此JTextArea框Java GUI上的滚动条,java,swing,user-interface,scroll,scrollbar,Java,Swing,User Interface,Scroll,Scrollbar,如何将垂直滚动条添加到此JTextArea框 b6 = new JTextArea (); b6.setBounds(210,100, 170, 240); 我试过做一些或多或少像这样的事情： b6 = new JTextArea (); b6.setBounds(210,100, 170, 240); JScrollPane scroller = new JScrollPane(b6); add(scroller); 使用时： JScrollPane scroll = new JScr
b6 = new JTextArea ();
b6.setBounds(210,100, 170, 240);
b6 = new JTextArea ();
b6.setBounds(210,100, 170, 240);
JScrollPane scroller = new JScrollPane(b6);
add(scroller);
JScrollPane scroll = new JScrollPane(b6);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
panel.add(scroll);
import java.awt.Color;
import java.awt.Container;
import java.awt.Point;
import java.awt.Window;
import java.awt.event.*;
import java.util.Random;
import javax.swing.*;
public class RoPaSgame {
private static final int DISPOSE_ON_CLOSE = 0;
static int humanWon; // use for statistic
static int win=0;
static int total=0;
static int tie=0;
static String userName;
static JTextArea b6;
static JTextField b7;
static JButton quitFrame;
static Container panelAns, panel;
static JFrame frameAns, frame;
public static void main(String[] args){ // main
gamePanel();// launch main game
introductionPanel(); // launch instruction
}
private static void introductionPanel(){ // give the instruction to the game
String text="RoPaS Game is a strategic game played between\ntwo people. The choices are rock, paper or scissors\ngesture with the hand. Paper covers rock, rock\ncrushes scissors,scissors cuts paper.";
JOptionPane.showMessageDialog(null,text, "Introduction", 0, new ImageIcon(System.getProperty("user.dir")+"/image/5.jpg"));
}
private static void gamePanel(){ // the main game panel
frame = new JFrame("RoPaS Game"); //the main frame of the game
panel = frame.getContentPane(); // creating a container panel, so we can place buttons where we pleased
panel.setLayout(null);
String[] iconString= new String[3]; // creating icon string name so we can place the directory in with little effort
int[] boundInt= new int[3]; // same idea
for(int i=0; i<=2; i++){ // creating the conditions
iconString[i]=System.getProperty("user.dir")+"/image/"+i+".jpg";
boundInt[i]=60+110*i;
}
JButton b1 = new JButton (" ", new ImageIcon(iconString[0]));
b1.setBackground(Color.white);
b1.setBounds(10,boundInt[0],150,100);
JButton b2 = new JButton (" ", new ImageIcon(iconString[1]));
b2.setBackground(Color.white);
b2.setBounds(10,boundInt[1],150,100);
JButton b3 = new JButton (" ", new ImageIcon(iconString[2]));
b3.setBackground(Color.white);
b3.setBounds(10,boundInt[2],150,100);//creating three buttons
JLabel l1 = new JLabel(new ImageIcon(System.getProperty("user.dir")+"/image/3.jpg"));
l1.setBounds(0, 0, 400, 50);
panel.add(l1);//creating a question button
JButton b4 = new JButton("Cheat");
b4.setBackground(Color.DARK_GRAY);
b4.setForeground(Color.WHITE);
b4.setBounds(210, 350, 80, 30); //create a code button, this button will give you an automatic win
JButton b5 = new JButton("Quit"); //quit
b5.setBackground(Color.DARK_GRAY);
b5.setForeground(Color.WHITE);
b5.setBounds(300, 350, 80, 30);
b6 = new JTextArea ();
b6.setBounds(210,100, 170, 240);
JScrollPane mySchroll = new JScrollPane(b6, ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
panel.add(mySchroll);
Random ran = new Random();
int ranName = ran.nextInt(99999);
b7 = new JTextField("Guest " + ranName);
b7.setBounds(260,60, 120, 25);
JLabel name = new JLabel("Name: ");
name.setBounds(210,60, 120, 25);
//place button on panel
panel.add(b1);
panel.add(b2);
panel.add(b3);
panel.add(b4);
panel.add(b5);
panel.add(b6);
panel.add(b7);
panel.add(name);
b1.addActionListener( //next three button will listen for which play pick and calculate the win in computeWinner
new ActionListener() {
public void actionPerformed( ActionEvent event ) {
computeWinner(1);
}});
b2.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event ) {
computeWinner(2);
}});
b3.addActionListener(
new ActionListener() {
public void actionPerformed( ActionEvent event ) {
computeWinner(3);
}});
b4.addActionListener(
new ActionListener() {//cheat button, hit the guy and get a win
public void actionPerformed( ActionEvent event ) {
win=win+1;
total=total+1;
JOptionPane.showMessageDialog(null,"You WIN again :)"+"\nWin/Loss rate: " + win+"/"+total+"\nTie: "+tie,"Cheater do prosper", 0, new ImageIcon(System.getProperty("user.dir")+"/image/4.jpg"));
}});
b5.addActionListener( //quit the game and show three beat up guys
new ActionListener() {
public void actionPerformed( ActionEvent event ) {
String text=" Joke:\n Ok, so in rock, paper, scissors \n I get howscissors beats paper and \n rock beats scissors butI don't get\n how paper beats rock is it supposed \n to magically wrap around rocks?\n why doesn't it do that to scissors?\n actually forget scissors why doesn't\n it do that to people? Paper should\n be able to suffocate us when we take\n notes and use daily contact with it\n if so we should be living in fear\n with our contact to it but we're not\n know why paper can't hurt us\n I always pick rock when I play\n when someone picks paper and says\n they beat me...I punch them in the face\n 'Oh, I'm sorry. I thought paper would\n protect you.' loser. \n\n Thank You for using RoPaS Game\n See you soon";
JOptionPane.showMessageDialog(null,text, "Thank You, Goof Bye", 0, new ImageIcon(System.getProperty("user.dir")+"/image/6.gif"));
System.exit(0);
}
});
frame.setSize(400, 420);
frame.getContentPane().setBackground(Color.LIGHT_GRAY);
frame.setVisible(true);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //set frame size and the game begins!
}
public static void computeWinner(int x){ // computing the winner
int computerChoice=computerRandomChoice();
int humanChoice=x;
String text,text1="";
String winningCombination= ""+Math.min(computerChoice, humanChoice)+Math.max(computerChoice, humanChoice);
switch(Integer.parseInt(winningCombination)){
case 12:
text = "Paper wins";
if(humanChoice==2) humanWon=1;
break;
case 13:
text = "Rock wins";
if(humanChoice==1) humanWon=1;
break;
case 23:
text = "Scissors wins";
if(humanChoice==3) humanWon=1;
break;
default: text="DRAW";
humanWon=2;
tie=tie+1;
}
if(humanWon==1){
text1="Human wins: ";
humanWon=0;
win=win+1;
total=total+1;
}else if(humanWon==2){
text1="";
humanWon=0;
}else{
text1="Computer wins: ";
total=total+1;
}
frameAns = new JFrame("RoPaS Game");
Point MainLoc = frame.getLocation();
frameAns.setLocation(410 + (int)MainLoc.getX(), 0 + (int)MainLoc.getY());
panelAns = frameAns.getContentPane();
panelAns.setLayout(null);
JLabel l0 = new JLabel(text1+text);
b6.append(b7.getText() + "\n" +text1+text+"\n\n");
l0.setBounds(10, 10, 300, 15);
panelAns.add(l0);
JLabel l01 = new JLabel("________________________________________________");
l01.setBounds(0, 10, 350, 25);
panelAns.add(l01);
//show the result in a new splash screen
JLabel l1 = new JLabel("| USER |");
l1.setBounds(60, 35, 150, 35);
panelAns.add(l1);
JLabel l2 = new JLabel("| COMPUTER |");
l2.setBounds(165, 35, 150, 35);
panelAns.add(l2);
JLabel l3 = new JLabel(new ImageIcon(System.getProperty("user.dir")+"/image/"+(humanChoice-1)+".jpg"));
l3.setBounds(0, 70, 170, 80);
panelAns.add(l3);
JLabel l4 = new JLabel(new ImageIcon(System.getProperty("user.dir")+"/image/"+(computerChoice-1)+".jpg"));
l4.setBounds(115, 70,170, 80);
panelAns.add(l4);
JLabel l015 = new JLabel("________________________________________________");
l015.setBounds(0, 10, 350, 280);
panelAns.add(l015);
JLabel l5 = new JLabel("Win/Loss rate: " + win+"/"+total);
l5.setBounds(5, 25, 150, 290);
panelAns.add(l5);
JLabel l6 = new JLabel("Tie: "+tie);
l6.setBounds(5, 30, 125, 310);
panelAns.add(l6);
quitFrame = new JButton("Quit"); //quit
quitFrame.setBackground(Color.DARK_GRAY);
quitFrame.setForeground(Color.WHITE);
quitFrame.setBounds(210, 165, 80,30);
panelAns.add(quitFrame);
quitFrame.addActionListener( //quit the game and show three beat up guys
new ActionListener() {
public void actionPerformed( ActionEvent event ) {
frameAns.setVisible(false);
}
});
frameAns.setSize(300, 230);
frameAns.getContentPane().setBackground(Color.LIGHT_GRAY);
frameAns.setVisible(true);
frameAns.setResizable(false);
frameAns.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
public static int computerRandomChoice(){// creating a random choice of rock paper or scissors by the computer
int result=(int)(Math.random()*3)+1;
return result;
}
}
导入java.awt.Color；
导入java.awt.Container；
导入java.awt.Point；
导入java.awt.Window；
导入java.awt.event.*；
导入java.util.Random；
导入javax.swing.*；
公共类游戏{
私有静态final int DISPOSE_ON_CLOSE=0；
static int humanWon；//用于统计
静态int-win=0；
静态整数总计=0；
静态int-tie=0；
静态字符串用户名；
静态区域b6；
静态JTextField b7；
静态JButton帧；
静态容器面板、面板；
静态JFrame框架，框架；
公共静态void main（字符串[]args）{//main
gamePanel（）；//启动主游戏
简介面板（）；//启动指令
}
private static void introductionPanel（）{//为游戏提供说明
String text=“RoPaS游戏是两个人之间进行的一种战略游戏。\n可以选择石头、布或剪刀\n用手触摸。布盖住石头、石头\n推剪刀、剪刀剪布。”；
showMessageDialog（null，文本，“简介”，0，新的ImageIcon（System.getProperty（“user.dir”）+“/image/5.jpg”）；
}
私有静态void gamePanel（）{//主游戏面板
frame=newjframe（“RoPaS游戏”）；//游戏的主框架
panel=frame.getContentPane（）；//创建一个容器面板，这样我们就可以将按钮放在我们喜欢的地方
panel.setLayout（空）；
String[]iconString=newstring[3]；//创建图标字符串名称，这样我们就可以轻松地将目录放入
int[]boundInt=newint[3]；//同样的想法
对于（int i=0；i请尝试以下方法：
JScrollPane scroll = new JScrollPane(b6);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
panel.add(scroll);
工作示例：
JFrame frame = new JFrame();
JPanel middlePanel = new JPanel();
frame.add(middlePanel);
final JTextArea display = new JTextArea(16, 58);
display.setEditable(true); // set textArea non-editable
JScrollPane scroll = new JScrollPane(display);
scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.
VERTICAL_SCROLLBAR_ALWAYS);
// Add Textarea in to middle panel
middlePanel.add(scroll);
add（滚动）；add带下划线，并表示创建一个新方法“add（JScrollPane）”…您必须将其添加到JPanel.Em…我只使用框架…没有JPanel上面的例子是有效的。你必须自己集成它。我不想使用像那样的意大利面代码。首先尝试学习基础知识。你可以尝试用简单的CL界面重新编程游戏，然后编写GUI。b6.setBounds（210100170240）；
-->停止这样做，学习如何使用LayoutManager。这将节省大量时间，使代码更干净、更简单。忘记调用setSize（）/setLocation/setBounds/setPreferredSize/setMaximumSize/setMinimumSize
这些都应该包含在LayoutManager代码中。你永远不需要自己调用它。这是固定大小的程序，不需要驻留…我只是尝试使用漂亮的布局来使它看起来更漂亮…是的，我理解一个包含数据的适当程序，等等必须使用布局管理器…（我只是尝试学习这种方法）即使对于非常简单的程序，使用布局管理器也更快、更干净、更简单。使用绝对定位（空布局）是一个坏习惯和非常糟糕的做法。绝对没有不使用它们的好参数。您还应该停止使用static
（除了main
方法声明和常量（static final
Stuff）。学习如何使用new…
。@Guillaume Polet如果你试图理解我不必做最好的程序，我只需要学习这样做的实际方法，这只是原因……这与你的问题直接相关：调用它毫无意义：b6.setBounds（210100170240）；JScrollPane scroller=新的JScrollPane（b6）；
您正在滚动窗格的视口中设置b6
的边界，但是视口和滚动窗格都使用它们的布局管理器，它将覆盖您的调用。如果我按照您的想法，您还应该取消JScrollPane及其JViewPort的布局。哦，等等，这意味着您还必须手动布局scrolLBAR和视口等等…看看它是如何在短时间内变成噩梦的，尽管这是一个非常简单的例子？