java.lang.string.join()方法使用定界符將給定元素連接起來(lái)并返回連接的字符串。請(qǐng)注意，如果元素為null，則將添加null。自JDK 1.8開(kāi)始，java字符串中包含join()方法。 java字符串中有兩種類(lèi)型的join()方法。句法：

public static String join(CharSequence deli, CharSequence... ele)

and

public static String join

(CharSequence deli, Iterable extends CharSequence> ele)

參數(shù)：

deli- delimiter to be attached with each element

ele- string or char to be attached with delimiter

返回： string joined with delimiter.

// Java program to demonstrate

// working of join() method

class Gfg1 {

public static void main(String args[])

{

// delimiter is "

String gfg1 = String.join(" < ", "Four", "Five", "Six", "Seven");

System.out.println(gfg1);

}

}

輸出：

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);

}

}

輸出：

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);

}

}

輸出：

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

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