Given: public interface API { //line 1
public void checkValue(Object value)
throws IllegalArgumentException; //line 2
public boolean isValidNumber(Object val) {
if (val instanceof Number) {
return true;
}else{
try {
Double.parseDouble(val.toString());
return true;
}catch (NumberFormatException ex) {
return false;
}
}
}
}
Which two changes need to be made to make this class compile? (Choose two.)

Question

Given: public interface API { //line 1
 public void checkValue(Object value)
 throws IllegalArgumentException; //line 2
 public boolean isValidNumber(Object val) {
 if (val instanceof Number) {
 return true;
 }else{
 try {
 Double.parseDouble(val.toString());
 return true;
 }catch (NumberFormatException ex) {
 return false;
 }
 }
 }
}
Which two changes need to be made to make this class compile? (Choose two.)

Accepted Answer

A. Change Line 1 to an abstract class:public abstract class API { E. Change Line 1 to extend java.lang.AutoClosable:public interface API extends AutoCloseable {

Answer

B. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;

Answer

C. Change Line 1 to AutoClosable:public API implements AutoCloseable {

Answer

D. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;

Given: public interface API { //line 1 public void checkValue(Object value) throws IllegalArgumentException; //line 2 public boolean isValidNumber(Object val) { if (val instanceof Number) { return…

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