Create temporary file with specified extension suffix

   

import java.io.File;

public class Main {

  public static void main(String[] args) throws Exception {
    File file1 = null;
    File file2 = null;
    file1 = File.createTempFile("JavaTemp", null);
    file2 = File.createTempFile("JavaTemp", ".java");

    System.out.println(file1.getPath());
    System.out.println(file2.getPath());
  }
}

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Create temporary file with specified extension suffix : Files « File Input Output « Java

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