Online Access Free 1Z1-803 Practice Test

Given:
Class A { }
Class B { }
Interface X { } Interface Y { }
Which two definitions of class C are valid?

• A.Class C extends A implements X { }
• B.Class C implements X, Y extends B { }
• C.Class C extends A, B { }
• D.Class C extends B implements X, Y { }
• E.Class C implements Y extends B { }

Given the code fragment:
String name = "Spot";
int age = 4;
String str ="My dog " + name + " is " + age;
System.out.println(str);
And
StringBuilder sb = new StringBuilder();
Using StringBuilder, which code fragment is the best potion to build and print the following string My dog Spot is 4

• A.sb.insert("My dog ").append( name + " is " + age); System.out.println(sb);
• B.sb.append("My dog " + name + " is " + age); System.out.println(sb);
• C.sb.insert("My dog ").insert( name ).insert(" is " ).insert(age); System.out.println(sb);
• D.sb.append("My dog ").append( name ).append(" is " ).append(age); System.out.println(sb);

Given:

What is the result?

• A.Three
• B.Compilation fails
• C.One
• D.Two

Given:
public class Painting {
private String type;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public static void main(String[] args) {
Painting obj1 = new Painting();
Painting obj2 = new Painting();
obj1.setType(null);
obj2.setType("Fresco");
System.out.print(obj1.getType() + " : " + obj2.getType());
}
}
What is the result?

• A.null : Fresco
• B.: Fresco
• C.A NullPointerException is thrown at runtime
• D.Fresco : Fresco

Given:
public class ComputeSum {
public int x;
public int y;
public int sum;
public ComputeSum (int nx, int ny) {
x = nx; y =ny;
updateSum();
}
public void setX(int nx) { x = nx; updateSum();}
public void setY(int ny) { x = ny; updateSum();}
void updateSum() { sum = x + y;}
}
This class needs to protect an invariant on the sum field.
Which three members must have the private access modifier to ensure that this invariant is maintained?

• A.The setY ( ) method
• B.The x field
• C.The ComputerSum ( ) constructor
• D.The y field
• E.The sum field
• F.The setX ( ) method