please kindly help solve this Java questions! God bless! Thanks!

Look at the following code. Which line will cause a compiler error? Line 1 public class ClassA Line 2 {Line 3 public ClassA () Line 4 public int methodi (int a) {} Line 5 public final int method2(double b) {} Line 6} Line 7 public ClassB extends ClassA Line 8 {Line 9 public ClassB () {} Line 10 public int method 1 (int b) {} Line 11 public int method2 (double c) {} Line 12} Look at the following code. The method in line __________ will override the method in line __________. Line 1 public class ClassA Line 2 {Line 3 public ClassA () Line 4 public int methodi (int a) {} Line 5 public int method2(int b) {} Line 6} Line 7 public ClassB extends ClassA Line 8 {Line 9 public ClassB () {} Line 10 public int method 1 (int b) {} Line 11 public int method2 (double c) {} Line 12}