"
public class Test01 {
public static void main(String[] args) {
int lineNum = 1;
int checkNum = 0;
for (int i = 1; i <= 1000; i++) {
System.out.print(i + "" "");
checkNum++;
if(checkNum == lineNum) {
lineNum++;
checkNum = 0;
System.out.println();
}
}
}
}