我建议将
String[][]调整为
CharSequence。这样，您就可以自由地使用
CharSequence进行操作，这也意味着您可以使用
java.util.regex.Matcher搜索字符串，而无需实现自己的搜索算法。
例如：
public class Main {
public static void main(String[] args) {
String[][] array2d = createArray();
int charSeqColumn = 0;
CharSequence charSequnce = new Array2DColumnCharSequnce(array2d, charSeqColumn);
System.out.println(charSequnce.toString());
Pattern patttern = Pattern.compile("ext");
Matcher matcher = patttern.matcher(charSequnce);
while (matcher.find()) {
String matchGroup = matcher.group();
int start = matcher.start();
int end = matcher.end() - 1;
String msg = MessageFormat.format("{0} matched at: [{1}] - [{2}]", matchGroup, start, end);
System.out.println(msg);
}
}
private static String[][] createArray() {
String[][] array2d = new String[2][10];
array2d[0][0] = "N";
array2d[0][1] = "e";
array2d[0][2] = "x";
array2d[0][3] = "t";
array2d[0][4] = " ";
array2d[0][5] = "N";
array2d[0][6] = "e";
array2d[0][7] = "x";
array2d[0][8] = "t";
array2d[0][9] = " ";
array2d[1][0] = "H";
array2d[1][1] = "e";
array2d[1][2] = "l";
array2d[1][3] = "l";
array2d[1][4] = "o";
array2d[1][5] = "W";
array2d[1][6] = "o";
array2d[1][7] = "r";
array2d[1][8] = "l";
array2d[1][9] = "d";
return array2d;
}
}
将输出
Next Next
ext matched at: [1] - [3]
ext matched at: [6] - [8]
我会这样实现
CharSequence适配。
class Array2DColumnCharSequnce implements CharSequence {
private int column;
private String[][] array2d;
private int endIndex;
private int startIndex;
public Array2DColumnCharSequnce(String[][] array2d, int column) {
this(array2d, column, 0, array2d[column].length);
this.array2d = array2d;
this.column = column;
}
public Array2DColumnCharSequnce(String[][] array2d, int column,
int startIndex, int endIndex) {
this.array2d = array2d;
this.column = column;
this.startIndex = startIndex;
this.endIndex = endIndex;
}
public int length() {
return endIndex - startIndex;
}
public char charAt(int index) {
String charString = array2d[column][startIndex + index];
return charString.charAt(0);
}
public CharSequence subSequence(int start, int end) {
Array2DColumnCharSequnce array2dColumnCharSequnce = new Array2DColumnCharSequnce(
array2d, column, start, end);
return array2dColumnCharSequnce;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder(this);
return sb.toString();
}
}
注意：Array2DColumnCharSequence只是一个快速实现，它尚未处理异常情况，也没有处理字符串列中有多个字符的情况。
为什么要使用CharSequence装饰器
将数组适配为CharSequence的区别在于，您使用了一个标准的Java接口，可以与许多其他类一起重用，因此非常灵活。
一些经常使用CharSequence作为参数的标准Java类
点击这里查看完整列表。
使用上面的代码并尝试此操作，以查看修饰符有多灵活。
public static void main(String[] args) {
String[][] array2d = createArray();
CharSequence charSequnce = new Array2DColumnCharSequnce(array2d, 0);
boolean contentEquals = "Next Next ".contentEquals(charSequnce);
System.out.println(contentEquals);
CharSequence column1CharSequnce = new Array2DColumnCharSequnce(array2d, 1);
String replaced = "I want to say Next Next ".replace(charSequnce, column1CharSequnce);
System.out.println(replaced);
}
将输出
true
I want to say HelloWorld
最终每个人都必须决定自己想要什么，以及什么更适合当前情况。如果可以几乎免费获得更多选项，则我更喜欢这种实现。
