如何使用printf和对话框格式化输出？

Question

使用Java，如何在对话框中显示以下“格式化代码”？

System.out.printf("%20s%20s%20.-5f%n%n", "Assessed Value:", "$", assessedValue); 
System.out.printf("%20s%20s%-5f%n%n", "Taxable Amount:", "$", taxedAmount);
System.out.printf("%20s%20s%-5f%n%n", "Tax Rate for $100.00:", "$", taxDollars);
System.out.printf("%20s%20s%-5f%n%n", "Property Tax:", "$", propertyTax);

Answer 1

您可以使用JOptionPane类以对话框的形式显示消息。

看起来像这样：

public void showDialog() {
    String message = String.format("%20s%20s%20.-5f%n%n", "Assessed Value:", "$", assessedValue) + String.format("%20s%20s%-5f%n%n", "Taxable Amount:", "$", taxedAmount) + String.format("%20s%20s%-5f%n%n", "Tax Rate for $100.00:", "$", taxDollars) + String.format("%20s%20s%-5f%n%n", "Property Tax:", "$", propertyTax);
    JOptionPane.showMessageDialog(null, message);
}

related pull request

Answer 2

在内部，这些调用仅使用String.format，您可以使用它来生成对话框的内容。