test.java

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import java.io.*;

public class Test {
	public static void main(String[] args) throws Exception {
		FileWriter fw = new FileWriter("111.txt");
		BufferedWriter bw = new BufferedWriter(fw);
		for(int i=1; i<= 25; i++) {
			bw.write(i + " ");
			if(i%5 == 0) bw.newLine();
		}
		
		bw.flush();
		bw.close();
	}
}