Solved: Java make sure only one condition is true

make sure only one condition is trueIn today’s fast-paced world of programming, developers often require their code to be efficient and robust. One common scenario is when multiple conditions are present, and we need to ensure that only one condition is true. In this article, we will explore the different ways to achieve this using Java, a powerful and versatile programming language. We will also dive into some concepts related to libraries, functions, and programming methods involved in crafting the solution. So, let’s get started!

The most effective and straightforward way to ensure that only one condition is true among several conditions is by using the exclusive or (XOR) operator. The XOR operation returns true if either of the operands is true, but not both. In Java, we can use the ^ (caret) symbol to perform the XOR operation.

public class OnlyOneConditionIsTrue {
    public static void main(String[] args) {
        boolean condition1 = true;
        boolean condition2 = false;
        boolean condition3 = true;

        boolean onlyOneIsTrue = condition1 ^ condition2 ^ condition3;
        System.out.println("Only One Condition Is True: " + onlyOneIsTrue);

The code snippet above demonstrates the XOR operator in action. Let’s go through the code step by step:

1. We declare a class named OnlyOneConditionIsTrue.
2. Inside the main method, we define three boolean conditions with different values.
3. We then use the XOR operator to check if only one of these conditions is true.
4. Finally, we print the result to the console.

Now, let’s explore some libraries and functions related to our problem.

Java Boolean Class and Methods

The java.lang.Boolean class is a wrapper class that wraps a boolean value. This class contains various utility methods to manipulate and operate on boolean values.

Some of the commonly used methods are:

  • Boolean.parseBoolean(String s): Parses a string as a boolean value, returning true if the string is “true” (case-insensitive) and false otherwise.
  • Boolean.valueOf(boolean b): Returns the corresponding Boolean instance, caching the instances for true and false values.
  • Boolean.logicalXor(boolean a, boolean b): Returns the result of a logical XOR operation between two boolean values.

We can use the Boolean.logicalXor method to achieve the same result as our previous example:

boolean onlyOneIsTrue = Boolean.logicalXor(condition1, Boolean.logicalXor(condition2, condition3));

Apache Commons Lang – BooleanUtils

In addition to the built-in Java libraries, third-party libraries such as Apache Commons Lang provide additional utilities and functions to work with boolean values. The BooleanUtils class is part of the commons-lang3 library and offers several utility methods for boolean and Boolean objects.

Some of the methods include:

  • BooleanUtils.xor(boolean[] array): Performs an XOR across an array of boolean values.
  • BooleanUtils.negate(boolean bool): Negates the specified boolean value.
  • BooleanUtils.toBoolean(int value): Converts an integer value to its corresponding boolean value.

To use the BooleanUtils.xor method from Apache Commons Lang, add the following dependency to your project:




implementation ‘org.apache.commons:commons-lang3:3.12.0’

Then, you can use the xor method like this:

import org.apache.commons.lang3.BooleanUtils;

// ...

boolean[] conditions = {condition1, condition2, condition3};
boolean onlyOneIsTrue = BooleanUtils.xor(conditions);

In summary, ensuring that only one condition is true among several conditions is an essential skill for every Java developer. By utilizing the XOR operator, Java’s built-in Boolean class, or third-party libraries like Apache Commons Lang, we can efficiently achieve this goal and create more robust code.

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