Java String concat()带示例

原文:https://www.geeksforgeeks.org/java-string-concat-examples/

Java 字符串 concat()方法将一个字符串连接到另一个字符串的末尾。此方法返回一个字符串，该字符串的值被传递到方法中，并附加到字符串的末尾。考虑下图:

插图:

Input:  String 1   : abc
        String 2   : def
        String n-1 : ...
        String n   : xyz
Output: abcdef...xyz

语法:

public String concat(String anostr)

参数:要连接在另一个字符串末尾的字符串

返回:串联(组合)字符串

示例:

Java

// Java program to Illustrate Working of concat() method
// with Strings
// By explicitly assigning result

// Main class
class GFG {

    // Main driver method
    public static void main(String args[])
    {
        // Custom input string 1
        String s = "Hello ";

        // Custom input string 2
        s = s.concat("World");

        // Explicitly assigning result by
        // Combining(adding, concatenating strings)
        // using concat() method

        // Print and display combined string
        System.out.println(s);
    }
}

输出

Hello World

例 2:

Java

// Java program to Illustrate Working of concat() method
// in strings where we are sequentially
// adding multiple strings as we need

// Main class
public class GFG {

    // Main driver method
    public static void main(String args[])
    {
        // Custom string 1
        String str1 = "Computer-";

        // Custom string 2
        String str2 = "-Science";

        // Combining above strings by
        // passing one string as an argument
        String str3 = str1.concat(str2);

        // Print and display temporary combined string
        System.out.println(str3);

        String str4 = "-Portal";
        String str5 = str3.concat(str4);
        System.out.println(str5);
    }
}

输出

Computer--Science
Computer--Science-Portal

从代码中可以看出，我们可以多次连接字符串，绕过旧的字符串，用新的字符串作为参数进行污染，并将结果字符串存储在字符串数据类型中。

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