正在开发大型程序，从一个文件读取并打印到另一个文件。看起来打印效果很好，但我们需要标签。我们的程序打印如下:
40851 50497 813082 1118366 1120629
34400 45547 824439 1425116 1429306
39249 48833 809627 1101561 1103908
57939 67308 821564 1126250 1128620
64000 76037 827086 1424632 1431210
34200 40240 554391 767810 772107
89310 101149 2351871 2971044 2980458
84370 95851 2470295 3096137 3105516
59700 71190 2290032 2905223 2909869
67600 79212 2419095 3031704 3034002
60200 71594 2348818 2969848 2972035
46000 56050 824092 1300904 1303163
我们需要它来打印总数和标签，如下所示(忽略数字):
这是我们的代码:
package hotelreport;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Date;
import java.util.Scanner;
public class HotelReport {
static File hotelFile = new File("store.txt");
static Path outputFilePath = Paths.get("storeAnswer.txt");
static int invoiceID;
static int serviceCode;
static String invoiceDate;
static double saleAmount;
static int rows = 13;
static int columns = 6;
static int[][] table;
public static void main(String[]args){
getData();
PrintWriter out;
File file = new File("storeAnswer.txt");
try {
out = new PrintWriter("storeAnswer.txt");
for(int i =0;i<=11;i++){
for(int j=0;j<=4;j++){
out.print(table[i][j]);
out.print("\t");
}
out.println("");
}
out.close();
} catch (FileNotFoundException e) {
System.out.println("File not found");
}
}
public static void getData(){
table = new int[rows][columns];
try {
Scanner sc = new Scanner(hotelFile);
while(sc.hasNext()){
invoiceID = sc.nextInt();
serviceCode = sc.nextInt();
String invoiceDate = sc.next();
saleAmount = sc.nextDouble();
switch(serviceCode){
case 0:
if(invoiceDate.startsWith("01")){
table[0][0]+=saleAmount;
}else if(invoiceDate.startsWith("02")){
table[1][0]+=saleAmount;
}else if(invoiceDate.startsWith("03")){
table[2][0]+=saleAmount;
}else if(invoiceDate.startsWith("04")){
table[3][0]+=saleAmount;
}else if(invoiceDate.startsWith("05")){
table[4][0]+=saleAmount;
}else if(invoiceDate.startsWith("06")){
table[5][0]+=saleAmount;
}else if(invoiceDate.startsWith("07")){
table[6][0]+=saleAmount;
}else if(invoiceDate.startsWith("08")){
table[7][0]+=saleAmount;
}else if(invoiceDate.startsWith("09")){
table[8][0]+=saleAmount;
}else if(invoiceDate.startsWith("10")){
table[9][0]+=saleAmount;
}else if(invoiceDate.startsWith("11")){
table[10][0]+=saleAmount;
}else if(invoiceDate.startsWith("12")){
table[11][0]+=saleAmount;
};
case 1:
if(invoiceDate.startsWith("01")){
table[0][1]+=saleAmount;
}else if(invoiceDate.startsWith("02")){
table[1][1]+=saleAmount;
}else if(invoiceDate.startsWith("03")){
table[2][1]+=saleAmount;
}else if(invoiceDate.startsWith("04")){
table[3][1]+=saleAmount;
}else if(invoiceDate.startsWith("05")){
table[4][1]+=saleAmount;
}else if(invoiceDate.startsWith("06")){
table[5][1]+=saleAmount;
}else if(invoiceDate.startsWith("07")){
table[6][1]+=saleAmount;
}else if(invoiceDate.startsWith("08")){
table[7][1]+=saleAmount;
}else if(invoiceDate.startsWith("09")){
table[8][1]+=saleAmount;
}else if(invoiceDate.startsWith("10")){
table[9][1]+=saleAmount;
}else if(invoiceDate.startsWith("11")){
table[10][1]+=saleAmount;
}else if(invoiceDate.startsWith("12")){
table[11][1]+=saleAmount;
};
case 2:
if(invoiceDate.startsWith("01")){
table[0][2]+=saleAmount;
}else if(invoiceDate.startsWith("02")){
table[1][2]+=saleAmount;
}else if(invoiceDate.startsWith("03")){
table[2][2]+=saleAmount;
}else if(invoiceDate.startsWith("04")){
table[3][2]+=saleAmount;
}else if(invoiceDate.startsWith("05")){
table[4][2]+=saleAmount;
}else if(invoiceDate.startsWith("06")){
table[5][2]+=saleAmount;
}else if(invoiceDate.startsWith("07")){
table[6][2]+=saleAmount;
}else if(invoiceDate.startsWith("08")){
table[7][2]+=saleAmount;
}else if(invoiceDate.startsWith("09")){
table[8][2]+=saleAmount;
}else if(invoiceDate.startsWith("10")){
table[9][2]+=saleAmount;
}else if(invoiceDate.startsWith("11")){
table[10][2]+=saleAmount;
}else if(invoiceDate.startsWith("12")){
table[11][2]+=saleAmount;
};
case 3:
if(invoiceDate.startsWith("01")){
table[0][3]+=saleAmount;
}else if(invoiceDate.startsWith("02")){
table[1][3]+=saleAmount;
}else if(invoiceDate.startsWith("03")){
table[2][3]+=saleAmount;
}else if(invoiceDate.startsWith("04")){
table[3][3]+=saleAmount;
}else if(invoiceDate.startsWith("05")){
table[4][3]+=saleAmount;
}else if(invoiceDate.startsWith("06")){
table[5][3]+=saleAmount;
}else if(invoiceDate.startsWith("07")){
table[6][3]+=saleAmount;
}else if(invoiceDate.startsWith("08")){
table[7][3]+=saleAmount;
}else if(invoiceDate.startsWith("09")){
table[8][3]+=saleAmount;
}else if(invoiceDate.startsWith("10")){
table[9][3]+=saleAmount;
}else if(invoiceDate.startsWith("11")){
table[10][3]+=saleAmount;
}else if(invoiceDate.startsWith("12")){
table[11][3]+=saleAmount;
};
case 4:
if(invoiceDate.startsWith("01")){
table[0][4]+=saleAmount;
}else if(invoiceDate.startsWith("02")){
table[1][4]+=saleAmount;
}else if(invoiceDate.startsWith("03")){
table[2][4]+=saleAmount;
}else if(invoiceDate.startsWith("04")){
table[3][4]+=saleAmount;
}else if(invoiceDate.startsWith("05")){
table[4][4]+=saleAmount;
}else if(invoiceDate.startsWith("06")){
table[5][4]+=saleAmount;
}else if(invoiceDate.startsWith("07")){
table[6][4]+=saleAmount;
}else if(invoiceDate.startsWith("08")){
table[7][4]+=saleAmount;
}else if(invoiceDate.startsWith("09")){
table[8][4]+=saleAmount;
}else if(invoiceDate.startsWith("10")){
table[9][4]+=saleAmount;
}else if(invoiceDate.startsWith("11")){
table[10][4]+=saleAmount;
}else if(invoiceDate.startsWith("12")){
table[11][4]+=saleAmount;
};
}
}
} catch (FileNotFoundException e) {
System.out.println("File not found. Check Location");
} catch (IOException e1) {
System.out.println("File coud not be created");
}
}
}
最佳答案
每当您调用打印命令(out.print)时，您只需更改每个值打印的内容
不相关，但如果你正在这样做:
if(invoiceDate.startsWith("01")){
table[0][0]+=saleAmount;
}else if(invoiceDate.startsWith("02")){
table[1][0]+=saleAmount;
}else if(invoiceDate.startsWith("03")){
table[2][0]+=saleAmount;
}else if(invoiceDate.startsWith("04")){
table[3][0]+=saleAmount;
}else ...
为什么不直接使用循环？:
for (int i=0; i<12; i++) {
if (invoiceDate.startsWith("0" + (i + 1)) {
table[i][0]+=saleAmount;
}
}
当然，仍然可以进行更多改进，但这至少是一个开始。
编辑:
啊，现在添加表格就更有意义了。您很可能希望在数据循环后添加月份(在其中打印新行)，并初始打印列值。
关于Java 编程，向表添加标签和总计，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/16369163/