在 JTextArea 中打印多达 363 行时,TextArea 将在第 43 行(帧边界)处截断。我已经将 JTextArea 放入 JScrollPane,并将 ScrollPolicy 设置为 ScrollPaneConstants.VERTICAL_SCROLLBAR_​​ALWAYS...。如何在写入超出框架边界的内容时使 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);
}

最佳答案

在调用 frame.setVisible(true) 之前,您应该始终调用 frame.pack()frame.setSize(...)。通常最好使用 frame.pack() 来让 Swing 组件按其首选大小绘制。

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 组件是 JTable,因为它支持表格数据。 JTextArea 不应用于格式化数据。

关于java - JTextArea 在 JFrame 边界处截断,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/18501809/

10-12 03:43