用java实现生成或显示文件的一些数字

用java实现生成或显示文件的一些数字

package fh;
import java.io.*;
public class DisplayFile {
public static boolean isPrime(int n) {
for (int k=2;k<=Math.sqrt(n);k++) {
if (n%k==0)
 return false;
 }
return true;
} 
public static void main(String[] arguments){

        try {
        FileInputStream file = new FileInputStream("d:\\x.txt"); 

         DataInputStream in=new  DataInputStream(file);
        try {
        while(true)  {
        int n1=in.readInt();
        int n2=in.readInt();
         System.out.println(n1+","+n2); }
         } catch (EOFException e) { in.close();}
        } catch (IOException e) { }    
    try
    {FileOutputStream file = new  FileOutputStream("d:\\x.txt");
DataOutputStream out=new  DataOutputStream(file);
for (int n=11;n<100;n+=2) {
if (isPrime(n)&&isPrime(n+2)) {
    out.writeInt(n);
out.writeInt(n+2);
} }  
 out.close();
 
} catch (IOException e) {};
}}

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