Java String concat() 示例

Java String 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，其中包含传递给该方法的字符串的值，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        

句法：

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：连接（组合）字符串

例子：

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

示例 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，我们可以做很多次，将绕过旧字符串的字符串与要被污染的新字符串作为参数连接起来，并将结果字符串存储在 String 数据类型中。