我正在嘗試創建一個包含 4 個字段的 GUI。網址用戶名密碼陳述在第一次，這些字段應該是空的。稍后，密碼字段旁邊的所有字段都應包含上次的信息。問題：GUI 窗口不應具有標準大小我想達到的目標：當窗口打開時，它應該動態調整到筆記本電腦的屏幕大小，例如中心，屏幕的 20%第四個字段（語句）可能很長，GUI 窗口會自動變得過長。我想達到的目標：對于第四個字段，應將字符串分解為多行。在將字段分解為三行而不是繼續將其分解為第四行之后，一個選項可能是滾動條。到目前為止，我已經找到了一些可以提供幫助的對象。選項窗格面板第四個長字段的JTextArea對于JTextArea，還有滾動窗格.setLineWrap(true) 換行.setWrapStyleWord(true)在一個單詞后換行我的代碼示例：JPanel pane = new JPanel();// adding GridLayoutpane.setLayout(new GridLayout(4,2));// fields are filled just as an example// later they will get substituted by variablesJTextField url = new JTextField ("https:testin.com");JTextField username = new JTextField ("theDude");JTextArea statement = new JTextArea("This statement can becomme very very very long :)");statement.setLineWrap(true);statement.setWrapStyleWord(true);JScrollPane scrollPane = new JScrollPane(statement);pane.add(scrollPane);// add infos to panepane.add(new JLabel ("Enter url: "));pane.add(url);pane.add(new JLabel ("Enter username: "));pane.add(username);pane.add(new JLabel ("Enter password: "));pane.add(new JPasswordField());pane.add(new JLabel ("Enter statement: "));pane.add(statement);//write it to a OK_CANCEL JOptionPaneint option = JOptionPane.showConfirmDialog(null,pane, "Fill all the fields",JOptionPane.OK_CANCEL_OPTION,JOptionPane.INFORMATION_MESSAGE);
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JTextArea您可以設置using的高度（可見行數）setRows()。試試下面的例子。我從你的代碼開始，做了一些改動。
import javax.swing.*;
import java.awt.*;
public class ThreeLinesTextArea
{
public static void main(String[] args)
{
JPanel pane = new JPanel();
// Change to GridBagLayout
pane.setLayout(new GridBagLayout());
JTextField url = new JTextField("https:testin.com");
JTextField username = new JTextField("theDude");
JTextArea statement = new JTextArea("This statement can becomme very very very long :)");
statement.setLineWrap(true);
statement.setWrapStyleWord(true);
// Use setRows() to make text area have multiple lines
statement.setRows(3);
JScrollPane scrollPane = new JScrollPane(statement);
//This line is removed. scrollPane is added at the end.
//pane.add(scrollPane);
pane.add(new JLabel("Enter url: "),
new GridBagConstraints(0, 0, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.NONE, new Insets(2, 2, 2, 2), 0, 0));
pane.add(url,
new GridBagConstraints(1, 0, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.HORIZONTAL, new Insets(2, 2, 2, 2), 0, 0));
pane.add(new JLabel("Enter username: "),
new GridBagConstraints(0, 1, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.NONE, new Insets(2, 2, 2, 2), 0, 0));
pane.add(username,
new GridBagConstraints(1, 1, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.HORIZONTAL, new Insets(2, 2, 2, 2), 0, 0));
pane.add(new JLabel("Enter password: "),
new GridBagConstraints(0, 2, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.NONE, new Insets(2, 2, 2, 2), 0, 0));
pane.add(new JPasswordField(15),
new GridBagConstraints(1, 2, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.HORIZONTAL, new Insets(2, 2, 2, 2), 0, 0));
pane.add(new JLabel("Enter statement: "),
new GridBagConstraints(0, 3, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.NONE, new Insets(2, 2, 2, 2), 0, 0));
pane.add(scrollPane,
new GridBagConstraints(1, 3, 1, 1, 1.0, 1.0, GridBagConstraints.WEST,
GridBagConstraints.HORIZONTAL, new Insets(2, 2, 2, 2), 0, 0));
int option = JOptionPane.showConfirmDialog(null, pane, "Fill all the fields",
JOptionPane.OK_CANCEL_OPTION, JOptionPane.INFORMATION_MESSAGE);
}
}
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