how to end a program in an if statement java

 if(letters >=5 && digits >=5)
                System.out.println("Great job! String is acceptable");
            //after use, letter and digit variables reset to 0 
            letters = 0; 
            digits = 0; 
        } //end a program within an if statement, which is nested with a while loop 
		  //with the use of System.exit(0)
		  //0 indicates successful termination 
		  //any non-zero value indicates an unsuccessful termination 

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