Java StringBuilder length()方法及示例

StringBuilder类的 length() 方法返回StringBuilder对象包含的字符数。该方法返回当前由该StringBuilder对象代表的字符序列的长度。

语法

public int length()

返回值： 该方法返回StringBuilder对象所包含的 字符序列的长度 。

下面的程序演示了StringBuilder类的length()方法。

例1:

// Java program to demonstrate// the length() Method.  class GFG {    public static void main(String[] args)    {          // create a StringBuilder object        // with a String pass as parameter        StringBuilder            str            = new StringBuilder("WelcomeGeeks");          // print string        System.out.println("String = "                           + str.toString());          // get length of StringBuilder object        int length = str.length();          // print length        System.out.println("length of String = "                           + length);    }}

输出:

String = WelcomeGeekslength of String = 12

例2:

// Java program to demonstrate// the length() Method.  class GFG {    public static void main(String[] args)    {          // create a StringBuilder object        // with a String pass as parameter        StringBuilder            str            = new StringBuilder("India is Great");          // print string        System.out.println("String = "                           + str.toString());          // get length of StringBuilder object        int length = str.length();          // print length        System.out.println("length of String = "                           + length);    }}

输出:

String = India is Greatlength of String = 14

参考资料:
https://docs.oracle.com/javase/10/docs/api/java/lang/StringBuilder.html#length()