演示由String，StringBuffer和CharBuffer实现的java.lang.CharSequence的行为。

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import java.nio.CharBuffer;

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/*来自 

 NowJava.com - 时代Java*/

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public class Main {

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  public static void main(String[] argv) {

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    StringBuffer stringBuffer = new StringBuffer("Hello World");

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    CharBuffer charBuffer = CharBuffer.allocate(20);

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    CharSequence charSequence = "Hello World";

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    printCharSequence(charSequence);

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    charSequence = stringBuffer;

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    printCharSequence(charSequence);

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    stringBuffer.setLength(0);

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    stringBuffer.append("hi");

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    printCharSequence(charSequence);

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    charSequence = charBuffer;

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    charBuffer.put("test");

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    charBuffer.clear();

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    charBuffer.put("Hello World");

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    charBuffer.flip();

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    printCharSequence(charSequence);

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    charBuffer.mark();

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    charBuffer.put("asdf");/** nowjava - 时代Java 提供 **/

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    charBuffer.reset();

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    printCharSequence(charSequence);

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    charBuffer.clear();

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    printCharSequence(charSequence);

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  }

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