Java StringBuilder codePointAt()方法

java.lang.StringBuilder.codePointAt() 方法返回指定索引处的字符(Unicode代码点)。该索引是指从0 (Unicode代码单元)到length()- 1范围的char值。

1 语法

public int codePointAt(int index)

2 参数

index ： 此为索引的char值。

3 返回值

此方法返回字符索引处的代码点值。

4 示例 

package com.yiidian;

/**
 * 一点教程网： http://www.yiidian.com
 */
/**
 * Java StringBuilder codePointAt()方法
 */
import java.lang.*;

public class StringBuilderDemo {

  public static void main(String[] args) {
  
    StringBuilder str = new StringBuilder("programming");
    System.out.println("string = " + str);

    // returns the codepoint at index 5
    int retval = str.codePointAt(5);
    System.out.println("Character(unicode point) = " + retval);
    
    str = new StringBuilder("amrood admin ");
    System.out.println("string = " + str);
    // returns the codepoint at index 6 i.e whitespace character
    retval = str.codePointAt(6);
    System.out.println("Character(unicode point) = " + retval);
  }
}

输出结果为：

Enums can never be cloned...
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