Java Conversion

In Java, you may need to convert data from one type to another. For example, you may need to convert a string to an integer, or a float to a double. In this tutorial, we'll discuss how to perform type conversion in Java.

Syntax

Java provides several methods to perform type conversion. Here are some examples:

1. To convert a string to an integer:

String str = "10";
int num = Integer.parseInt(str);

2. To convert an integer to a string:

int num = 10;
String str = Integer.toString(num);

3. To convert a float to a double:

float num = 10.5f;
double dbl = (double) num;

Example

Let's consider an example where we want to read user input from the console and perform some calculations. We need to convert the user input to integer before we can perform the calculations. Here are the steps:

1. Ask the user to input two numbers:

Scanner sc = new Scanner(System.in);
System.out.println("Enter the first number:");
String str1 = sc.nextLine();
System.out.println("Enter the second number:");
String str2 = sc.nextLine();

2. Convert the user input to integers:

int num1 = Integer.parseInt(str1);
int num2 = Integer.parseInt(str2);

3. Perform the calculations and print the result:

int sum = num1 + num2;
System.out.println("The sum of " + num1 + " and " + num2 + " is " + sum);

Output

When the program runs, it should prompt the user to input two numbers. After the user enters the numbers, the program should add them and print the result to the console.

Explanation

In the example above, we used the Integer.parseInt() method to convert the user input from string to integer. This allows us to perform calculations with the input.

We also used string concatenation to print the result to the console. Since the result is an integer, we had to use string concatenation to combine the integers and the string "is" in a single output statement.

Use

Type conversion is an essential part of Java programming. You may need to convert data types to perform calculations or store data in a format that is compatible with other systems.

Important Points

Here are some important points to keep in mind when performing type conversion in Java:

• When converting a string to a number, make sure that the string contains only numbers. Otherwise, an exception may be thrown.
• Always check for overflow or underflow when converting between data types.
• Be careful when converting between floating-point numbers and integers, as rounding errors may occur.

Summary

In this tutorial, we discussed how to perform type conversion in Java. We covered the syntax, example, output, explanation, use, important points, and summary of type conversion in Java. With this knowledge, you can now perform type conversion in your Java programs.