Java system.out.print 打印 JOptionPane.ShowMessageDialog答案

【问题标题】：Java system.out.print to print JOptionPane.ShowMessageDialogJava system.out.print 打印 JOptionPane.ShowMessageDialog
【发布时间】：2011-06-11 06:14:09
【问题描述】：

如何将 system.out.print 消息打印到 JOptionPane.ShowMessageDialog 我需要它在 for 循环中运行，然后在 for 循环之外我需要它在 JOptionPane.ShowMessageDialog 框内显示。我真的很紧张。我将不胜感激任何帮助。谢谢！

    public static void main(String[] args) {

    //A. Enter the Number Of Loans to compare
    String numberOfLoansString = JOptionPane.showInputDialog("Enter the Number Of Loans to Compare"); 
    //Convert numberOfLoansString to int
    int numberOfLoans = Integer.parseInt(numberOfLoansString);

    //B. Enter the Selling Price of Home
    String sellingPriceString = JOptionPane.showInputDialog("Enter the Loan Amount");
    //Convert homeCostString to double
    double sellingPrice = Double.parseDouble(sellingPriceString);

    //C. Enter the Down Payment on the Home
    String downPaymentString = JOptionPane.showInputDialog("Enter the down payment on the Home");
    double downPayment = Double.parseDouble(downPaymentString);

    //Get the loanAmount by Subtracting the Down Payment from homeCost
    double loanAmount = sellingPrice - downPayment;

    //D. Ask the following for as many number of loans they wish to compare
    //D1 Get the interest rate
    double[] annualInterestRatesArray = new double[numberOfLoans];
    double[] monthlyInterestRateArray = new double[numberOfLoans];
    int[] numberOfYearsArray = new int[numberOfLoans];
    double[] monthlyPaymentArray = new double[numberOfLoans];
    double[] totalPaymentArray = new double[numberOfLoans];
    int counter = 1;

    for (int i=0; i < numberOfLoans; i++)
    {
        String annualInterestRateString = JOptionPane.showInputDialog("Enter the interest rate for Scenario " + counter);
        double annualInterestRate = Double.parseDouble(annualInterestRateString);
        annualInterestRatesArray[i] = (annualInterestRate);

        //Obtain monthly interest rate
        double monthlyInterestRate = annualInterestRate / 1200;
        monthlyInterestRateArray[i] = (monthlyInterestRate);

        //D2 Get the number of years
        String numberOfYearsString = JOptionPane.showInputDialog("Enter the number of years for Scenario " + counter);
        int numberOfYears = Integer.parseInt(numberOfYearsString);
        numberOfYearsArray[i] = (numberOfYears);

        //Calculate monthly payment
        double monthlyPayment = loanAmount * monthlyInterestRate / (1 - 1 / Math.pow(1 + monthlyInterestRate, numberOfYears * 12));
        //Format to keep monthlyPayment two digits after the decimal point
        monthlyPayment = (int)(monthlyPayment * 100) / 100.0;
        //Store monthlyPayment values in an array
        monthlyPaymentArray[i] = (monthlyPayment);

        //Calculate total Payment
        double totalPayment = monthlyPaymentArray[i] * numberOfYears * 12;
        //Format to keep totalPayment two digits after the decimal point
        totalPayment = (int)(totalPayment * 100) / 100.0;
        totalPaymentArray[i] = (totalPayment);

        counter++;
    }

    StringBuilder sb = new StringBuilder();
            for (int i = 0; i < numberOfLoans; i++) {
                sb.append(String.format("\n", sellingPrice, downPayment, loanAmount, annualInterestRatesArray[i], numberOfYearsArray[i], monthlyPaymentArray[i]));
            }
    String toDisplay=sb.toString();

    JOptionPane.showMessageDialog(null, sb.toString(), toDisplay, JOptionPane.INFORMATION_MESSAGE);


}

这不起作用的任何原因？

【问题讨论】：

标签： java joptionpane

【解决方案1】：

使用 StringBuffer。

 StringBuffer sb=new StringBuffer();
 for (int i = 0; i < numberOfLoans; i++) {
      sb.append(your_string);
 }
 JOptionPane.showMessageDialog(parent,sb.toString());

【讨论】：

StringBuilder 在 JDK 5 及更高版本中优先用于此场景。
我的 java 概念越来越老了。我需要更新:) 谢谢

【解决方案2】：

尝试将输出写入 StringBuilder

StringBuilder sb = new StringBuilder() for (int i = 0; i

    sb.append(String.format("%d\t%s\t%d   %.2f   %.2f\n", sellingPrice, downPayment, loanAmount, annualInterestRatesArray[i], numberOfYearsArray[i], monthlyPaymentArray[i]));

}
String toDisplay=sb.toString();

【讨论】：

非常感谢！这似乎有效，但最后没有打印任何内容。我没有收到任何错误消息。我的代码在顶部。谢谢！

【解决方案3】：

使用您自己的设置“System.out”使用的打印机。重定向到字符串编写器或创建您自己的打印机实现并使用它来收集“StringBuilder”中的所有打印输出。一旦在循环之外获取收集的“字符串”并将其显示在对话框中。

我建议不要使用 'System.out.println' altlogether，但我认为您别无选择。

【讨论】：