Question

for(Item i : itemArray){
System.out.format("%1s%50s%50s", "name = " + i.getName(), "color = " + i.getColor(), "quantity = " + i.getQuantity());
System.out.println();

我正在尝试迭代一个项目数组，打印出格式化表格中的每个项目。每个项目都有名称，颜色，数量和价格。

目前它是如何出现的：

Name: bike       Color: black       Quantity: 1      Price: 6.00
Name: ladder       Color: blue       Quantity: 150      Price: 9.00
Name: dolphin       Color: orange       Quantity: 15      Price: 100000.00
Name: key       Color: red       Quantity: 12      Price: 510.00

这就是我需要的样子：

Name: bike       Color: black      Quantity: 1       Price: 6.00
Name: ladder     Color: blue       Quantity: 150     Price: 9.00
Name: dolphin    Color: orange     Quantity: 15      Price: 100000.00
Name: key        Color: red        Quantity: 12      Price: 510.00

我已阅读格式api但仍无法弄明白!!!请帮忙。

Answer 1

您的格式字符串应为Name：param指定多个字符宽度（%1s）：

System.out.format("%15s%50s%50s", "name = " + i.getName(), "color = " + i.getColor(), "quantity = " + i.getQuantity());

更易读的只是将变量注入格式字符串：

System.out.format("Name: %-10s  Color: %-10s Quantity: %-10s Price: %s", ...)

Answer 2

尝试

        String fmt = "Name: %-10s Color: %-10s Quantity: %d%n";
        System.out.printf(fmt, "bike", "black", 1);
        System.out.printf(fmt, "ladder", "blue", 1);

输出

Name: bike       Color: black      Quantity: 1
Name: ladder     Color: blue       Quantity: 1

苦苦于正确格式化字符串

2 个答案: