StringBuilder类deleteCharAt()方法 (StringBuilder Class deleteCharAt() method)

• deleteCharAt() method is available in java.lang package.

  deleteCharAt()方法在java.lang包中可用。

• deleteCharAt() method is used to delete the character at the given index.

  deleteCharAt()方法用于删除给定索引处的字符。

• deleteCharAt() 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.

  deleteCharAt()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。

• deleteCharAt() method may throw an exception at the time of assigning index.

  deleteCharAt()方法在分配索引时可能会引发异常。

  StringIndexOutOfBoundsException - This exception may throw when the given argument value is less than 0 or larger than or similar to length().

  StringIndexOutOfBoundsException-当给定的参数值小于0或大于或类似于length()时，可能引发此异常。

Syntax:

句法：

public StringBuilder deleteCharAt(int indices);

Parameter(s):

参数：

• int indices – represents the index of deleting character.

  int index –表示删除字符的索引。

Return value:

返回值：

The return type of this method is StringBuilder, it returns this StringBuilder object.

该方法的返回类型为StringBuilder ，它返回此StringBuilder对象。

Example:

例：

// Java program to demonstrate the example // of StringBuilder deleteCharAt(int indices)// method of StringBuilder public class DeleteCharAt {
       public static void main(String[] args) {
           // Creating an StringBuilder object        StringBuilder st_b = new StringBuilder("Java World");        // Display before deletion        System.out.println("st_b = " + st_b);        // By using deleteCharAt(4) method is to delete the character        // i.e. whitespace at the given index 4        st_b = st_b.deleteCharAt(4);        // Display st_b after deletion        System.out.println("st_b.deleteCharAt(4) = " + st_b);    }}

Output

输出量

st_b = Java Worldst_b.deleteCharAt(4) = JavaWorld

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