9+ Java Return 使い方 Article

Return Type In Java Video19 YouTube from www.youtube.com

Introduction

Java is one of the most popular programming languages in the world, known for its versatility and reliability. One of its most important features is the "return" statement, which allows developers to specify the value that a method should return to the calling code. In this article, we will explore the different ways to use the "return" statement in Java to make your code more efficient and effective.

What is the "return" statement?

The "return" statement is a keyword in Java that allows a method to send a value back to the calling code. The value can be a primitive data type, an object, or even another method. The "return" statement is often used at the end of a method to send the final result of the method back to the calling code.

Using "return" in a method

To use the "return" statement in a method, you must first declare the method's return type. For example, if you want your method to return an integer, you would declare it as follows:

public int myMethod() {

// method code goes here

return myInt;

}

Using "return" in a conditional statement

The "return" statement can also be used in a conditional statement to exit a method early if a certain condition is met. For example, if you have a method that checks if a number is negative, you could use the "return" statement to exit the method if the number is indeed negative:

public boolean isNegative(int num) {

if(num < 0) {

return true;

}

return false;

}

Using "return" with objects

The "return" statement can also be used with objects. For example, if you have a method that creates a new object, you could use the "return" statement to return that object to the calling code:

public MyClass createObject() {

MyClass obj = new MyClass();

return obj;

}

Conclusion

The "return" statement is a powerful tool in Java that allows developers to send values back to the calling code. Whether you are returning a primitive data type, an object, or even another method, the "return" statement can help you make your code more efficient and effective. By mastering the usage of "return" in Java, you can take your programming skills to the next level and create more sophisticated and complex applications.