How to use concat in java

The concat() method in Java is used to append another string to the end of an existing string to create a new string. Specific usage includes: splicing multiple strings. Adds fixed text to an existing string. Used in series.

Usage of concat() in Java

concat()# The ## method is a built-in method of the String class in Java and is used to append another string to the end of the existing string.

Syntax:

public String concat(String str)

Parameters:

• str - To be appended to the current There are strings of strings.

Return value:

A new string, which is the concatenation of the existing string and the additional string.

Usage:

concat() method can be used in the following scenarios:

• Concatenate multiple strings:

  String str1 = "Hello";
  String str2 = "World";
  String result = str1.concat(str2); //结果为 "HelloWorld"

• Add fixed text to an existing string:

  String str = "This is ";
  String addition = "a test";
  String result = str.concat(addition); //结果为 "This is a test"

• Use in concatenation:

  String str1 = "John";
  String str2 = "Doe";
  String result = "Name: ".concat(str1).concat(" ").concat(str2); //结果为 "Name: John Doe"

  Note:

  • concat() method creates a new string. It does not modify existing strings.
  If
  • str is null, concat() will generate a "null" string.
  • concat() Performs efficient string concatenation on immutable strings.

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