How to use concat in java

Usage of concat in Java

The concat() method is a method in the String class and is used to concatenate two strings. It returns a new string that is the result of concatenating the two original strings.

Syntax

public String concat(String str)

Parameters

• str - The string to be concatenated

Return value

The new string after concatenation

Usage method

concat( ) method is used to concatenate two strings into a new string. It can be used in the following ways:

String str1 = "Hello";
String str2 = "World";
String newStr = str1.concat(str2);
System.out.println(newStr); // 输出：HelloWorld

In the above example, str1 and str2 are concatenated into a new string newStr , the value of this string is "HelloWorld".

Note

• The concat() method does not modify the original string.
• If the str parameter is null, a "null" string will be generated.
• The concat() method can also be used to concatenate strings and other basic types (such as int, double), but these values ​​will be converted to strings.

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