Java 迭代字符串的字符

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import java.text.CharacterIterator;

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import java.text.StringCharacterIterator;

/** from 

n o w  j a v a  . c o m**/

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public class Main {

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  public static void main(String[] argv) {

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    CharacterIterator it = new StringCharacterIterator("abcd");

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    // Iterate over the characters in the forward direction

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    for (char ch = it.first(); ch != CharacterIterator.DONE; ch = it.next()) {

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      // Use ch ...

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    }

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    // Iterate over the characters in the backward direction

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    for (char ch = it.last(); ch != CharacterIterator.DONE; ch = it.previous()) {

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      // Use ch ...

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    }

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    // Other methods

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    char ch = it.first(); // a

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    ch = it.current(); // a

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    ch = it.next(); // b/* 来 自 时 代 J a v a 公 众 号 - N o w J a v  a . c o m*/

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    ch = it.current(); // b

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    System.out.println(ch);

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    ch = it.last(); // d

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    int pos = it.getIndex(); // 3

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    System.out.println(ch);

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    ch = it.next(); // DONE

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    pos = it.getIndex(); // 4

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    System.out.println(ch);

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    ch = it.previous(); // d

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    System.out.println(ch);

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    ch = it.setIndex(1); // b

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    // Change the characters

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    ((StringCharacterIterator) it).setText("efgh");

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    ch = it.current(); // e

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    // Create an iterator on a substring (efgh)

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