Java StringBuilder length（）方法与示例

StringBuilder类的length()方法 (StringBuilder Class length() method)

length() method is available in java.lang package.
length()方法在java.lang包中可用。
length() method is used to return the length of this sequence (i.e. it counts the number of characters denoted by this object).
length()方法用于返回此序列的长度(即，它计算此对象表示的字符数)。
length() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
length()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
length() method does not throw an exception at the time of returning length.
length()方法在返回length时不会引发异常。

Syntax:

句法：

    public int length();

Parameter(s):

参数：

It does not accept any parameter.
它不接受任何参数。

Return value:

返回值：

The return type of this method is int, it returns the counts of the number of characters stored in this object.

此方法的返回类型为int ，它返回存储在此对象中的字符数的计数。

Example:

例：

// Java program to demonstrate the example 
// of int length() method of StringBuilder 
public class Length {
public static void main(String[] args) {
// Creating an StringBuilder object
StringBuilder st_b = new StringBuilder("Java World ");
// Display st_b 
System.out.println("st_b = " + st_b);
// By using length() method is to return the length
// of st_b object
int len = st_b.length();
// Display st_b length
System.out.println("st_b.length() = " + len);
}
}

Output

输出量