4

在 JTextArea 中打印多达 363 行时，TextArea 将在大约第 43 行（帧边界）处截断。我已经将 JTextArea 放入 JScrollPane 中，并将 ScrollPolicy 设置为 ScrollPaneConstants.VERTICAL_SCROLLBAR_​​ALWAYS.... 如何在超出框架边界写入内容时使 JTextArea 可滚动？

public static double principalAmt, intRate, balance, monthlyIntRate, monthlyPayment, monthlyIntPayment, monthlyPrincipalPayment;
public static int termLength, months;

static Box infoBox = Box.createVerticalBox();
static Box graphBox = Box.createVerticalBox();

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

public AmortizationTable() {

    // User input
    principalAmt = 150000;
    termLength = 15;
    intRate = 0.05;

    // Calculated values
    balance = principalAmt;
    monthlyIntRate = intRate / 1200;
    months = termLength * 12;
    monthlyPayment = principalAmt * (monthlyIntRate *
            Math.pow(1 + monthlyIntRate, months) / (Math.pow(1 + monthlyIntRate, months) - 1));

    JFrame amortFrame = new JFrame();
    JPanel amortPanel = new JPanel();
    Box amortBox = Box.createVerticalBox();
    JTextArea amortText = new JTextArea();
    amortText.setEditable(false);

    String[] amortArray = new String[months];

    JLabel amortTitle1 = new JLabel("---------------------------------------------------"
            + "-------------------------------------------");
    JLabel amortTitle2 = new JLabel("Payment\tMonthly Payment\tInterest Paid\t\tPrincipal Paid\t\tBalance");
    JLabel amortTitle3 = new JLabel("-------------------------------------------------"
            + "---------------------------------------------");

    amortText.setText(amortText.getText() + amortTitle1.getText() + "\n");
    amortText.setText(amortText.getText() + amortTitle2.getText() + "\n");
    amortText.setText(amortText.getText() + amortTitle3.getText() + "\n");

    for(int i=0; i<months; i++) {

        monthlyIntPayment = balance * monthlyIntRate;
        monthlyPrincipalPayment = monthlyPayment - monthlyIntPayment;
        balance -= monthlyPrincipalPayment;
        if(balance<0)
            balance = -balance;

        amortArray[i] = ("" + (i+1) + "\t" + 
            new DecimalFormat("$0.00").format(monthlyPayment) + "\t\t" +
                new DecimalFormat("$0.00").format(monthlyIntPayment) + "\t\t" +
            new DecimalFormat("$0.00").format(monthlyPrincipalPayment) + "\t\t" +
                new DecimalFormat("$0.00").format(balance) + "\t\n");

        amortText.setText(amortText.getText() + amortArray[i]);

    }

    JScrollPane amortScroll = new JScrollPane(amortText);
    amortScroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
    amortBox.add(amortScroll);
    amortPanel.add(amortBox);
    amortFrame.add(amortPanel);
    amortFrame.setVisible(true);
}
4

1 回答 1

3

您应该始终调用frame.pack()或frame.setSize(...)在调用 frame.setVisible(true) 之前调用。通常最好使用 frame.pack() 让 Swing 组件以它们的首选尺寸绘制。

所以接下来你实际上需要给文本区域一个关于它的首选大小应该是什么的建议。这是通过执行以下操作来完成的：

JTextArea amortText = new JTextArea(25, 70);

最后一个更好的 Swing 组件可以使用，JTable因为它支持表格数据。JTextArea 不应用于格式化数据。

于 2013-08-29T03:55:17.910 回答