如何在Java中打印信息表
如何在Java中打印信息表
提问于 2013-09-07 19:06:37
我正在尝试用Java打印表，我想知道做这件事的最好方法是什么？
我尝试打印新行并使用\t使内容对齐，但它不起作用。有没有一种方法可以做到这一点，或者是更好的方式？
回答 5
Stack Overflow用户
回答已采纳
发布于 2013-09-07 19:16:52
您可以使用System.out.format(...)
示例：
final Object[][] table = new String[4][];
table[0] = new String[] { "foo", "bar", "baz" };
table[1] = new String[] { "bar2", "foo2", "baz2" };
table[2] = new String[] { "baz3", "bar3", "foo3" };
table[3] = new String[] { "foo4", "bar4", "baz4" };
for (final Object[] row : table) {
System.out.format("%15s%15s%15s%n", row);
}结果：
foo bar baz
bar2 foo2 baz2
baz3 bar3 foo3
foo4 bar4 baz4或者使用以下代码进行左对齐输出：
System.out.format("%-15s%-15s%-15s%n", row);Stack Overflow用户
发布于 2018-06-02 03:07:54
用于对数组列表进行表格格式化的常规函数：
public static String formatAsTable(List<List<String>> rows)
{
int[] maxLengths = new int[rows.get(0).size()];
for (List<String> row : rows)
{
for (int i = 0; i < row.size(); i++)
{
maxLengths[i] = Math.max(maxLengths[i], row.get(i).length());
}
}
StringBuilder formatBuilder = new StringBuilder();
for (int maxLength : maxLengths)
{
formatBuilder.append("%-").append(maxLength + 2).append("s");
}
String format = formatBuilder.toString();
StringBuilder result = new StringBuilder();
for (List<String> row : rows)
{
result.append(String.format(format, row.toArray(new String[0]))).append("\n");
}
return result.toString();
}用法：
List<List<String>> rows = new ArrayList<>();
List<String> headers = Arrays.asList("Database", "Maintainer", "First public release date", "Latest stable version", "Latest release date");
rows.add(headers);
rows.add(Arrays.asList("4D (4th Dimension)", "4D S.A.S.", "1984", "v16.0", "2017-01-10"));
rows.add(Arrays.asList("ADABAS", "Software AG", "1970", "8.1", "2013-06"));
rows.add(Arrays.asList("Adaptive Server Enterprise", "SAP AG", "1987", "16.0", "2015"));
rows.add(Arrays.asList("Apache Derby", "Apache", "2004", "10.14.1.0", "2017-10-22"));
System.out.println(formatAsTable(rows));结果是：
Database Maintainer First public release date Latest stable version Latest release date
4D (4th Dimension) 4D S.A.S. 1984 v16.0 2017-01-10
ADABAS Software AG 1970 8.1 2013-06
Adaptive Server Enterprise SAP AG 1987 16.0 2015
Apache Derby Apache 2004 10.14.1.0 2017-10-22 Stack Overflow用户
发布于 2017-10-15 00:32:39
这是一种方法：
public class StoreItem {
private String itemName;
private double price;
private int quantity;
public StoreItem(String itemName, double price, int quantity) {
this.setItemName(itemName);
this.setPrice(price);
this.setQuantity(quantity);
}
public String getItemName() {
return itemName;
}
public void setItemName(String itemName) {
this.itemName = itemName;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public static void printInvoiceHeader() {
System.out.println(String.format("%30s %25s %10s %25s %10s", "Item", "|", "Price($)", "|", "Qty"));
System.out.println(String.format("%s", "----------------------------------------------------------------------------------------------------------------"));
}
public void printInvoice() {
System.out.println(String.format("%30s %25s %10.2f %25s %10s", this.getItemName(), "|", this.getPrice(), "|", this.getQuantity()));
}
public static List<StoreItem> buildInvoice() {
List<StoreItem> itemList = new ArrayList<>();
itemList.add(new StoreItem("Nestle Decaff Coffee", 759.99, 2));
itemList.add(new StoreItem("Brown's Soft Tissue Paper", 15.80, 2));
itemList.add(new StoreItem("LG 500Mb External Drive", 700.00, 2));
return itemList;
}
public static void main (String[] args) {
StoreItem.printInvoiceHeader();
StoreItem.buildInvoice().forEach(StoreItem::printInvoice);
}
}输出：
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原文链接：
https://stackoverflow.com/questions/18672643
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