Category Archives: InterviewQuestions

Find Largest of Three Numbers using Ternary Operator in Java

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Write a java program to find largest of three numbers using ternary operator in java. This problem can also be asked like, find maximum of three numbers using conditional operator.

Given three input numbers, Write a java code to print largest or biggest of three numbers using ternary operator.

Suppose, Given three input numbers a, b and c. If a is greater than b and c then a is the largest of three numbers. Similarly, if b is greater than a and c then b is the largest of three numbers else c is largest.

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Check Balanced Parentheses in an Expression

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Write a java code to check balanced parentheses in an expression using stack.

Given an expression containing characters ‘{‘,’}’,'(‘,’)’,'[‘,’]’. We have to write a code to check whether an input string has valid parentheses.

An input string is valid if:

Open brackets must be closed by the same type of brackets.
Open brackets must be closed in the correct order.

Example –

i) {[]}) – Invalid

ii) {()}[] – Valid

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Java Program to Reverse a String using Stack

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Write a java program to reverse a string using stack data structure. Given an input string, We have to write a java code to reverse a string using stack.

In my previous tutorial, I have explained java program to reverse a string using recursion.

Before solving this problem, Let’s understand what is a stack data structure. →