H >= 3, w >= 3 (в примере ниже: h = 5, w = 7)

 import java.util.Scanner; 
 
public class Test { 
 
    public static void main(String[] args) { 
        Scanner scanner = new Scanner(System.in); 
        int h = scanner.nextInt(); 
        int w = scanner.nextInt(); 
        System.out.print("*"); 
        for (int i = 0; i < w - 2; i++) { 
            System.out.print("-"); 
        } 
        System.out.println("*"); 
        for (int i = 0; i < h - 2; i++) { 
            System.out.print("|"); 
            for (int j = 0; j < w - 2; j++) { 
                System.out.print(" "); 
            } 
            System.out.println("|"); 
        } 
        System.out.print("*"); 
        for (int i = 0; i < w - 2; i++) { 
            System.out.print("-"); 
        } 
        System.out.println("*"); 
    } 
}