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Double Clicking JAR file does not open Command Prompt
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
public class Sysout{
public static void main(String[] args) throws IOException{
    System.out.println("Hello World!");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String msg = br.readLine();
    System.out.println(msg);
    br.read();
}
}

assoc .jar=jarfileterm
ftype jarfileterm="C:Program FilesJavajre7binjava.exe" -jar "%1" %*

ftype jarfile="C:Program FilesJavajre7binjavaw.exe" -jar "%1" %*

ftype jarfileterm=cmd /s /k ""C:Program FilesJavajre7binjava.exe" -jar "%1" %*"
assoc .jar=jarfileterm