Java String join() 示例

Java.lang。 字符串.join()方法将给定的元素与分隔符连接起来，并返回连接后的字符串。注意，如果元素为 null，则添加 null。join ()方法从 JDK 1.8 开始包含在Java字符串中。
Java 字符串中有两种类型的join()方法。
句法：

public static String join(CharSequence deli, CharSequence... ele)  
and  
public static String join
(CharSequence deli, Iterable ele)     
Parameters:
deli- delimiter to be attached with each element 
ele- string or char to be attached with delimiter
Returns :  string joined with delimiter.

// Java program to demonstrate
// working of join() method
  
class Gfg1 {
    public static void main(String args[])
    {
        // delimiter is "<" and elements are "Four", "Five", "Six", "Seven"
        String gfg1 = String.join(" < ", "Four", "Five", "Six", "Seven");
  
        System.out.println(gfg1);
    }
}

输出：

Four < Five < Six < Seven

// Java program to demonstrate
// working of join() method
  
class Gfg2 {
    public static void main(String args[])
    {
        // delimiter is "  " and elements are "My",
        // "name", "is", "Niraj", "Pandey"
        String gfg2 = String.join("  ", "My", "name", "is", "Niraj", "Pandey");
  
        System.out.println(gfg2);
    }
}

输出：

My name is Niraj Pandey

// Java program to demonstrate
// working of join() method
  
class Gfg3 {
    public static void main(String args[])
    {
        // delimiter is "->" and elements are "Wake up", 
        // "Eat", "Play", "Sleep", "Wake up"
  
        String gfg3 = String.join("-> ", "Wake up", "Eat",
                      "Play", "Sleep", "Wake up");
  
        System.out.println(gfg3);
    }
}

输出：

Wake up-> Eat-> Play-> Sleep-> Wake up