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Given the code fragment:
What is the result?
Answer: C
C. This is a casting issue but the code fails to compile so the answer is c. The ClassCastException is a runtime exception where you're trying to cast an object to a different object type, but here the code fails to compile because you cannot cast a long to a string.
Source: Adapted from community discussion — theCloudCTO
Which three statements describe the object-oriented features of the Java language? (Choose three.)
Answer: ACE
The correct Answer is ACE: A - Correct, The objects CAN be reused B - Wrong, If your superclass not is abstract and an interface, you choose if you want override or not the methods C - Correct, Objects can share behaviors with other objects, this is polymorphism D - Wrong, you can create a empyt package E - Correct, Object is the root class of all other objects, this comes automatically even if you don't put "extends Object" after the class declaration F - Wrong, you can create a empyt class
Source: Adapted from community discussion — iSnover
Given the following code:
What is the output?
Answer: A
Antwort C , D, public static void main(String[] args) { String []planetStrings = { "Mercury", "Venus", "Erath", "Mars"}; System.out.println(planetStrings.length); System.out.println(planetStrings[1].length()); } 4 5
Source: Adapted from community discussion — dya45792
You are developing a banking module. You have developed a class named ccMask that has a maskcc method. Given the code fragment:
You must ensure that the maskcc method returns a string that hides all digits of the credit card number except the four last digits (and the hyphens that separate each group of four digits). Which two code fragments should you use at line n1, independently, to achieve this requirement? (Choose two.)
Answer: BC
Correct is B and C, because: - A is Wrong, will print "XXXX-XXXX-XXXX-1234-5678-9101-1121" because String is immutable and in the line 2 of the Anwser is an code isolated, not chance the "sb" variable - B is Correct, you can acess the value of the method substring with the parrametrs direclty - C is Correct, with the method "append" of StringBuilder in the line 2 of the Answer, you can concatenate with an String and can choose the range of String that you want concatenate - D is Wrong, because de range is incorrect
Source: Adapted from community discussion — iSnover
Given: Acc.java:
Which statement is true?
Answer: B
Correct ans is B: Even though Test is child of ACC we are not able to access protected r variable. Reason is packages are different. If you want to access protected member in different package then it can be accessed only using "Child class object" not using parent class or Child class reference hold by parent. For protected r to be visible need to create object of Test t=new Test ; int pr=t.r; Here ACC obj=new Test //We are calling protected using parent class reference hence invalid. If protected r is in same package then it would be valid .
Source: Adapted from community discussion — Ru_H33
Given:
What is the result?
Answer: C
class Base { public void test() { System.out.println("Base "); } } public class DerivedA extends Base{ public void test() { System.out.println("DerivedA "); } } public class DerivedB extends DerivedA{ public void test() { System.out.println("DerivedB "); } public static void main(String[] args) { Base b1 = new DerivedB(); Base b2 = new DerivedA(); Base b3 = new DerivedB(); b1 = (Base)b3; Base b4 = (DerivedA)b3; b1.test(); b4.test(); } }
Source: Adapted from community discussion — juipeng
Given the code fragment:
What is the result?
Answer: C
The while loop executes continuously, and keeps shoving strings into the array. Eventually the program will fail, because it will run out of memory (hence the error). Nothing gets printed, as there are no exceptions thrown and the println statement is never reached.
Source: Adapted from community discussion — 365everyday
Given:
What is the result?
Answer: D
public static void main(String[] args) { System.out.println("5 + 2 = " + 3 + 4); System.out.println("5 + 2 = " + (3 + 4)); } 5 + 2 = 34 5 + 2 = 7
Source: Adapted from community discussion — odzio33
Given the code fragment:
What is the result?
Answer: C
public static void main(String[] args) { String[][] arr = {{"A", "B", "C"},{"D", "E"}}; for(int i = 0; i < arr.length; i++){ for (int j = 0; j<arr[i].length; j++){ System.out.print(arr[i][j] + " "); if(arr[i][j].equals("B")){ break; } } continue; } } A B D E
Source: Adapted from community discussion — odzio33
Given the code fragment:
What is the result?
Answer: C
String str2 = " "; str2.trim(); // if we use str2 = str2.trim(); the answer will be true true System.out.println(str2.equals("") + " " + str2.isEmpty()); The trim() method in Java String is a built-in function that eliminates leading and trailing space Answer is C false false
Source: Adapted from community discussion — odzio33
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