2012-04-23总结

 

import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

public class A {
	// 给你一组字符串如：iu7i8hy4jnb2,让你编程输出里面的数字：7842
	public static void printNumber(String testString) {
		for (int i = 0; i < testString.length(); i++) {
			char a = testString.charAt(i);
			if (a - '0' >= 0 && a - '9' <= 0) {
				System.out.println(a);
			}
		}
	}

	// 给你一组字符如{1,3,4,7,2,1,1,5,2},让你输出里面出现次数最多且数值最大的一个,出现几次
	public static void fun4() {
		int[] a = { 1, 2, 3, 4, 7, 9, 6, 1, 1, 1, 9, 1, 1, 1, };
		Arrays.sort(a);
		for (int i = 0; i < a.length; i++) {
			System.out.print(a[i] + "   ");
		}
		int maxNumber = a[a.length - 1], maxCount = 1;
		int curNumber, curCount = 1;
		for (int i = a.length - 1; i > 0; i--) {
			curNumber = a[i];
			if (a[i] == a[i - 1] && i != 1) {
				curCount++;
			} else {
				if (curCount > maxCount) {
					maxCount = curCount;
					maxNumber = curNumber;
				}
				curCount = 1;
			}
		}
		System.out.println("\nmaxCount: " + maxCount + ",maxNumber: " + maxNumber);
	}

	// 给你一组字符如{1,3,4,7,2,1,1,5,2},让你输出里面出现次数最多且数值最大的一个,出现几次
	public static void haveFun() {
		int[] a = { 9, 1, 3, 2, 2, 3, 4, 5, 6, 7, 7, 8, 8, 7, 7, 7, 7, 7, 7 };
		Arrays.sort(a);
		int maxNumber = a[a.length - 1], maxCount = 1, currentNumber = a[0], currentCount = 1;
		for (int i = a.length - 1; i > 0; i--) {
			currentNumber = a[i];
			if (a[i] == a[i - 1] && i != 1) {
				currentCount++;
			} else {
				if (currentCount > maxCount) {
					maxCount = currentCount;
					maxNumber = currentNumber;
				}
				currentCount = 1;
			}
		}
		System.out.print("\nmaxCount: " + maxCount + ",maxNumber: " + maxNumber);
	}

	// 给你一组字符串让你把它倒叙输出(利用StringBuffer的reverse()方法)
	public static void pordwed(String pordwed) {
		StringBuffer sb = new StringBuffer(pordwed);
		String s1 = (sb.reverse()).toString();
		System.out.println(s1);
	}

	// 假设字符串类似这样的aba和aab就相等，现在随便给你二组字符串，请编程比较他们看是否相等
	public static boolean myEquals(String s1, String s2) {
//		if (s1.length() != s2.length()) {
//			return false;
//		}
//		char[] arrayS1 = s1.toCharArray(), arrayS2 = s2.toCharArray();
//		Set resultS1 = new HashSet();
//		Set resultS2 = new HashSet();
//		for (int i = 0; i < arrayS1.length; i++) {
//			resultS1.add(arrayS1[i]);
//		}
//		for (int i = 0; i < arrayS2.length; i++) {
//			resultS2.add(arrayS2[i]);
//		}
//		return resultS1.size() == resultS2.size();
		char[] c1 = s1.toCharArray();
		char[] c2 = s2.toCharArray();
		Arrays.sort(c1);
		Arrays.sort(c2);
		return Arrays.toString(c1).equals(Arrays.toString(c2));
	}

	// *创建一个静态方法，给它传入一个对象，请循环的打印出该对象所在类的类名和所实现的方法名,以及属性名，并且按照名称大小
	public static void allProperty(Object object) {
		System.out.println("类名: " + object.getClass().getName());
		List propertyList = new ArrayList<String>();
		Method[] method = object.getClass().getDeclaredMethods();
		for (int i = 0; i < method.length; i++) {
			propertyList.add(method[i].getName());
		}
		Field[] fields = object.getClass().getDeclaredFields();
		for (int i = 0; i < fields.length; i++) {
			propertyList.add(fields[i].getName());
		}
		Collections.sort(propertyList);
		for (Object property : propertyList) {
			System.out.println((String) property);
		}
	}

	// 求两个数的公约数，M，N
	public static void divisor(int a, int b) {
		List as = new ArrayList();
		for (int i = 1; i <= a; i++) {
			if (a % i == 0 && b % i == 0) {
				as.add(i);
			}
		}
		// as.retainAll(bs);//排除，相当于求了交集 **!
		Iterator lit0 = as.listIterator();
		while (lit0.hasNext()) {
			System.out.print("  " + lit0.next());
		}
	}

	// 实现数组复制Object 的clone() 方法
	public static void sortArray() {
		int[] a = { 3, 43, 1, 2, 5, 7, 12, 44 };
		int[] b = (int[]) a.clone();
		for (int i : b) {
			System.out.print("  " + i);
		}
	}

	// 编程显示某一文件目录下的文件名
	public static void listAllFile(String path,String tab) {
		File file = new File(path);
		File[] files = file.listFiles();
		for (int i = 0; files != null && i < files.length; i++) {
			System.out.println(tab + files[i].getName());
			if (files[i].isDirectory()){
				listAllFile(files[i].getPath() , tab + "\t");
			}
		}
	}

	public static void main(String args[]) {
		// printNumber("iu7i8hy4jnb2");
		// char[] a = { 1, 3, 4, 7, 2, 1, 1, 5, 2 };
		// printMoreNumber(a);
		// pordwed("aaaabc");
		// haveFun();
		// replaceAll()方法的正则匹配
		// System.out.println("iu7i8hy4jnb2 ".replaceAll( "[^\\d]", ""));
		 System.out.println(myEquals("aab", "aba"));
		// Test t = new Test();
		// allProperty(t);
		// divisor(10, 8);
//		sortArray();
//		listAllFile("C:\\Users\\Percival\\Desktop\\work","");
	}
}

class Test {
	private String storm;
	private String fuck;
	private String you;

	void function1() {
	}

	void function2() {
	}

	void function3() {
	}

	void function4() {
	}
}