IgnoreCaseSort

最新推荐文章于 2021-03-09 18:14:42 发布

转载最新推荐文章于 2021-03-09 18:14:42 发布 · 353 阅读

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本文介绍了一种在Java中实现的忽略大小写差异的字符串排序方法。通过创建自定义Comparator来实现字符串的不区分大小写的比较，并展示了如何使用该Comparator对字符串数组进行排序。此外，还对比了默认排序（区分大小写）与忽略大小写的排序结果。

/**
 * Sort an array of strings, ignore case difference.
 */
package StrRegex;

import java.util.*;

/**
 * Create a Comparator that returns the outcome
 * of a case-insensitive string comparison.
 */
class IgnoreCaseComp implements Comparator< String > {
	
	/**
	 * Implement the compare() method so that it
	 * ignore case differences when comparing strings.
	 */
	public int compare(String strA, String strB) {
		return strA.compareToIgnoreCase(strB);
	}
}

/**
 * Demonstrate the case-insensitive string comparator.
 */
public class IgnoreCaseSort {

	/**
	 * @param args
	 */
	public static void main(String[] args) {

		// Create a sample array of strings.
		String strs[] = { "alpha", "Gamma", "Zeta", "beta" };
		
		// Show the initial order.
		System.out.print("Initial order : ");
		for (String s : strs) {
			System.out.print(s + " ");
		}
		
		System.out.println("\n");
		
		// Sort the array, but ignore case differences.
		// Create a case-insensitive string comparator.
		IgnoreCaseComp icc = new IgnoreCaseComp();
		
		// Sort the strings using the comparator.
		Arrays.sort(strs, icc);
		
		// Show the case-insensitive sorted order.
		System.out.print("Case-insensitive sorted order : ");
		for (String s : strs) {
			System.out.print(s + " ");
		}
		
		System.out.println("\n");
		
		// For comparison, sort the strings using the default order,
		// which is case-sensitive.
		Arrays.sort(strs);
		
		// Show the case-sensitive sorted order.
		System.out.print("Default, case-sensitive sorted order : ");
		for (String s : strs) {
			System.out.print(s + " ");
		}
		
		System.out.println("\n");
	}
}