Java中toCharArray()方法

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Java中 toCharArray() 方法详解

《Thinking in Java》Chapter11中存在下列代码



package holding;

import java.util.*;

public class QueueDemo {

  public static void printQ(Queue queue) {

    while(queue.peek() != null)

      System.out.print(queue.remove() + " ");

    System.out.println();

  }

  public static void main(String[] args) {

//Character

    Queue<Character> qc = new LinkedList<Character>();

    for(char c : "Brontosaurus".toCharArray())

      qc.offer(c);

    printQ(qc);

  }

}

我们经常会使用到 toCharArray() 方法，深层次的查看这个方法，我们来探讨一下。下面是Java类库中给出的代码。



  /**

     * Converts this string to a new character array.

     *

     * @return  a newly allocated character array whose length is the length

     *          of this string and whose contents are initialized to contain

     *          the character sequence represented by this string.

     */

    public char[] toCharArray() {

        // Cannot use Arrays.copyOf because of class initialization order issues

        char result[] = new char[value.length];

        System.arraycopy(value, 0, result, 0, value.length);

        return result;

    }

分析：将一个字符串转换成一个 Character 型的字符数组，并且这里面的字符是原封不动的拿进去的，意思就是说，包含一切字符均转换成相应的字符数组。

将上面的程序修改如下【在改字符串中添加一些空格的】



//: holding/QueueDemo.java

// Upcasting to a Queue from a LinkedList.

package holding;

import java.util.*;

public class QueueDemo {

  public static void printQ(Queue queue) {

    while(queue.peek() != null)

      System.out.print(queue.remove() + " ");

    System.out.println();

  }

  public static void main(String[] args) {

//Character

    Queue<Character> qc = new LinkedList<Character>();

    for(char c : "Brontosaurus".toCharArray())

      qc.offer(c);

    printQ(qc);

  }

}