java使JOptionPane打印多组数据
有人能告诉我如何在一个对话框中打印所有三行客户数据,如下面的屏幕截图所示吗?现在它一次只打印一行
String custNum = JOptionPane.showInputDialog("Enter cust numb:");
while (!custNum.equalsIgnoreCase("quit")) {
String custName = JOptionPane.showInputDialog("Enter cust name:");
do {
try {
kilowattUsed = Double.parseDouble(JOptionPane.showInputDialog("Enter kilowatt(s) used:"));
}
catch (NumberFormatException e) {
kilowattUsed = minKilowatt - 1;
}
if (kilowattUsed < minKilowatt || kilowattUsed >= maxKilowatt) {
JOptionPane.showMessageDialog(null,"Please enter a valid number");
}
} while (kilowattUsed <= minKilowatt || kilowattUsed >= maxKilowatt);
if (kilowattUsed < lowRateKilowattMin) {
amtOwed = kilowattUsed * highRate;
}
else {
amtOwed = kilowattUsed * lowRate;
}
totalOwed += amtOwed;
numCustomers++;
JOptionPane.showMessageDialog(null,custNum + " | " + custName + " | "
+ String.format("%.1f",kilowattUsed) + " | " + "$" + String.format("%.2f",amtOwed));
custNum = JOptionPane.showInputDialog("Enter cust number:");
}
# 1 楼答案
java中用于新行的字符是新行字符
\n
,因此如果在行间的最后一个字符串中添加该字符,那么它们将出现在以下几行:下面是一个简单的例子来演示:
其结果将是:
我希望这能有所帮助:)
# 2 楼答案
需要注意的一个关键理解是,JOptionPane的show方法的第二个参数可以是任何Swing组件,包括JTable,它是显示表格数据的最佳组件。所以我建议你
JOptionPane.showMessageDialog(...)
的第二个参数传递