String类的compareTo()和compareToIgnoreCase()

compareTo()的返回值是int,它是先比较对应字符的大小(ASCII码顺序)

1、如果字符串相等返回值0

2、如果第一个字符和参数的第一个字符不等,结束比较,返回他们之间的差值（ascii码值）（负值代表：前字符串的值小于后字符串，正值代表：前字符串大于后字符串）

3、如果第一个字符和参数的第一个字符相等,则以第二个字符和参数的第二个字符做比较,以此类推,直至比较的字符或被比较的字符有一方全比较完,这时就比较字符的长度. 

compareToIgnoreCase()方法是不区分大小写，返回值是int，比较方式与compareTo()相同

		String s1 = "adger";
		String s2 = "adgerfa";
		String s3 = "ADGER";
		String s4 = "adher";
		System.out.println(s1.compareTo(s2));//-2
		System.out.println(s1.compareTo(s3));//32
		System.out.println(s1.compareToIgnoreCase(s3));//0
		System.out.println(s3.compareToIgnoreCase(s4));//-1

应用：不分大小写，比较字符串的大小，按照从小到大排序

package interview;
 
import java.util.Scanner;
 
/**
 * 比较输入字符串的大小：不分大小写，按照字符串的大小排序
 * String类的compareToIgnoreCase()方法
 * @author USER
 *
 */
public class TestCompareTo {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String string = in.nextLine();
		String[] s = string.split(" ");
		for (int i = 0; i < s.length-1; i++) {
			for (int j = i+1; j < s.length; j++) {
				if (s[i].compareToIgnoreCase(s[j]) > 0) {
					String temp = s[i];
					s[i] = s[j];
					s[j] = temp;
				}
			}
		}
		
		for (int i = 0; i < s.length; i++) {
			System.out.print(s[i]+" ");
		}
		
	}
}
 
//测试
//输入：fas rew ada ADE FAA re bci def BCr aC Bc
//输出：aC ada ADE Bc bci BCr def FAA fas re rew 

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