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

st_b = Java World
st_b.length() = 11

翻译自: https://www.includehelp.com/java/stringbuilder-length-method-with-example.aspx