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Here is an example of using the concat() method in Java:
String str1 = "Hello";
String str2 = "World";
String str3 = str1.concat(str2);
System.out.println(str3); // Output: HelloWorld
In this example, we first declare two string variables, str1 and str2, and assign them the values “Hello” and “World”, respectively. We then use the concat() method to concatenate the two strings and assign the result to a third string variable, str3. Finally, we print the value of str3, which is “HelloWorld”.
In conclusion, the Java programming language provides a powerful and efficient way to concatenate strings using the “+” operator. However, for more complex string concatenation operations, the Java String concat() function can be used. This function allows developers to concatenate multiple strings together in a single operation, making their code more concise and easier to read. By understanding the differences between the “+” operator and the concat() function, developers can choose the best approach for their specific use case and create more efficient and effective Java applications.