java stringbuilder 长度_Java StringBuilder length()用法及代码示例

StringBuilder类的length()方法返回StringBuilder对象包含的字符数。此方法返回当前由StringBuilder对象表示的字符序列的长度。

用法:

public int length()

返回值：此方法返回StringBuilder对象包含的字符序列的长度。

下面的程序演示StringBuilder类的length()方法：

范例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 = WelcomeGeeks

length of String = 12

范例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 Great

length of String = 14