import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class ArrayListDemo {
public static void main(String[] args) throws IOException {
List<String> list01;
List<String> list02;
List<String> list03;
list01 = Arrays.asList("3D", "UX", "RAM", "CPU");
list02 = Arrays.asList("200", "300", "400", "500");
list03 = Arrays.asList("20", "30", "40", "50");
ArrayList<List> total = new ArrayList<>();
total.add(list01);
total.add(list02);
total.add(list03);
writeFile(total, ",", System.getProperty("line.separator"));
}
private static void writeFile(ArrayList<List> arrayList, String separator, String newLine) throws IOException {
BufferedWriter writer = new BufferedWriter(new FileWriter(new File("testResult.csv")));
StringBuilder builder = new StringBuilder();
for (List list : arrayList) {
for (int i = 0; i < list.size(); i++) {
if ( i != list.size() - 1) {
builder.append(String.valueOf(list.get(i))).append(separator);
} else {
builder.append(list.get(i)).append(newLine);
}
}
}
writer.write(builder.toString());
writer.flush();
writer.close();
}
}
$ cat TestResult.csv
3D,UX,RAM,CPU
200,300,400,500
20,30,40,50
