Java Practice exam 2025 Questions and Answers

Java Practice exam 2025 Questions
and Answers


Which of the following correctly defines and instantiates an array that can store 30

integers? - ANSWER✔✔-int[] array = new int[30];


What is output by the code below?




int[] array = {33,14,37,11,27,4,6,2,6,7}; System.out.println(array.length); - ANSWER✔✔-

10


What is output by the code below?




int[] array = {7,8,10,11,4,3};




array[array[0]/2]=15;

,array[array[4]+1]=9;




array[array.length/3+2]=5;




array[1]=array[0]+4;




System.out.println(array[4]); - ANSWER✔✔-6


What is output by the code below?




int[] array = {5,10,3,6,9,15};




for(int i=0; i<array.length/2; i=i+2)




{




array[i]=array[array.length-i-2];

,}




System.out.println(array[0]); - ANSWER✔✔-9


What is output by the code below?




String[] ray = {"abc","ade","123","234","678"};




System.out.println(ray[ray.length-2]); - ANSWER✔✔-234


What is output by the code below?




String[] ray = {"abc","ade","123","234","678"};




System.out.println(ray[3].substring(0,2) + ray[4].charAt(1)); - ANSWER✔✔-237


What is output by the code below?




String[] ray = {"abc","ade","123","234","678"};

, System.out.println(ray[1].charAt(2)); - ANSWER✔✔-e


What is output by the code below?




int[] nums = new int[10];




for (int i=0; i < nums.length; i++)




{




nums[i] = i*2;




}




System.out.println(nums[9]); - ANSWER✔✔-18


What is returned by method bot given the call shown below?




//client code in the runner or main method