At first sight I found missing semicolumn and brace:

/** Display's a rectangle */
void show  Rectangle(int argWide, int  argTall) {
for(int i = 0; i < argWide; i++) {
System.out.print("*");
{
System.out.print("\n");
for(int i = 0; i < (argTall - 2); i++) {
--> System.out.print("*");
--> }
for(int j = 0; j < (argWide - 2); j++) {
System.out.print(" ");
}
System.out.println("*");
}