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JavaSE/bin/note/JavaSe总结

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+public static ��װ�� valueOf(��Ӧ������������);
+int intValue(Integer i);
+static int Integer.parseInt(String);
+
+String:
+public char charAt(int index);
+public int compareTo(String str);
+public String(byte[] bytes, int offset, int length);
+public String(char[] value, int offset, int count);
+public boolean endsWith(String suffix);
+public int indexOf(int ch);
+public int indexOf(int ch, int fromIndex);
+public int indexOf(String str);
+public int indexOf(String str, int fromIndex);
+public int lastIndexOf(int ch) 
+public boolean isEmpty();
+public String substring(int beginIndex);
+public String substring(int beginIndex, int endIndex);
+public char[] toCharArray();
+length();
+toLowerCase();
+toUpperCase();
+Arrays.toString(arr);
+Arrays.sort(arr);
+Arrays.copyOf(int[] original, int newLength);
+
+����
+[]-------��ʾһ��λ�ã������λ����ֻ��һ�ֿ��ܣ����Ժ��Բ�д
+()-------��ʾһ����ϣ���������λ�������������ģ�
+{}-------���������ַ������ȵķ�Χ
+public String[] split(regex);
+public boolean matches(regex);
+
+StringBuffer/StringBuilder��
+append(Object obj);
+insert(int index, Object obj);
+delete(int beginIndex, int endIndex);
+deleteCharAt(int index);
+
+Collection:
+boolean add(Object obj);
+void add(int index, Object obj);
+int size();
+void clear();
+boolean isEmpty();
+boolean contains();
+E get(int index);
+E set(int index, E element);
+E remove(int index);
+boolean remove(Object obj);
+void addFirst(E e); //only used in LinkedList
+void addLast(E e); //only used in LinkedList
+public static List Arrays.asList(Array arr);
+list.toArray(arr);
+Collections.sort(list);
+
+Map:
+V put(K k, V v);
+Set<K> keySet();
+int size();
+V remove(K k);
+boolean remove(K k, V v);
+public boolean containsKey(Object key);
+public boolean containsValue(Object value);
+V get(Object key);
+boolean isEmpty();
+public void clear();
+
+Iterator;
+Iterator it = list/set.iterator();
+boolean hasNext();
+E next();
+
+File:
+public static String separator;
+public boolean createNewFile() throws IOException;
+public boolean mkdir();
+public boolean delete();
+public File getAbsoluteFile();
+public String getAbsolutePath();
+public String getName();
+public int compareTo(File f);
+public long length();��ȡ�ļ��з��ŵĸ���
+public File[] listFiles();
+public String[] list();
+public boolean exists();
+public boolean isAbsolute();
+public boolean isDirectory();
+public boolean isFile();
+public boolean isHidden();
+
+Reader��//�ַ�
+	FileReader: 	public int read(), 
+					public int read(char[] buf)
+	BufferedReader: public int read(), 
+					public int read(char[] buf, int off, int len), 
+					String readLine()
+Writer: //�ַ�
+	FileWriter: 	public void write(char[] buf), 
+					public void write(char[] buf, int beginIndex, int len), 
+					public void write(String str), 
+					public void write(String str, int beginIndex, int len)
+	BufferedWriter: public void write(int ch), 
+					public void write(char[] buf, int off, int len), 
+					public void write(String str, int off, int len), 
+					public void newLine()
+InputStream: //�ֽ�
+	FileInputStream:  	 public int read(), 
+						 public int read(byte[] buf), 
+						 public int read(byte[] buf,int beginIndex,int len)
+	BufferedInputStream: public int read(), 
+						 public int read(byte[] buf,int beginIndex,int len)
+OutputStream: //�ֽ�
+	FileOutputStream: 	  public void write(int b), 
+						  public void write(byte[] buf), 
+						  public void write(byte[] buf,int beginIndex,int len)
+	BufferedOutputStream: public void write(int b), 
+						  public void write(byte[] buf,int beginIndex,int len)
+InputStreamReader/OutputStreamWriter //ת����
+
+for(int i=1;i<arr.length;i++){//ð���㷨
+    for(int j=1;j<arr.length-i;j++){
+    //�����
+}
+
+�۰���ң�����ָ��Ԫ���������е�λ�ã���������ڷ���-1
+		public static int zheBan(int[] ar,int num){			
+			int begin=0;//������ʼλ��			
+			int end=ar.length-1;//���ҽ���λ��
+			/* 1.�������λ��С����ʼλ�ã����������鲻����
+			 * 2.�������λ�ô�����ʼλ�ã��������ж��Ԫ��
+			 * 3.�������λ�õ�����ʼλ�ã�������ֻ��һ��Ԫ��
+			 * */
+			while(begin<=end){				
+				int middle=(begin+end)/2;//�м�λ��
+				if(num==ar[middle]){
+					return middle;
+				}else if(num>ar[middle]){
+					begin=middle+1;
+				}else{
+					end=middle-1;
+				}
+			}
+			return -1;
+	    }
+
+�̣߳���word��Ľ�ͼ��
+

JavaSE/src/mine/eight/random/Random.java

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+package mine.eight.random;
+
+import java.util.Scanner;
+
+public class Random {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner sc = new Scanner(System.in);
+		int number = (int) (Math.random()*5);//[0,5)
+		String[] name = {"����","����","����","��","������"};
+		System.out.print("1.�齱\t2.�˳�");
+		int num = sc.nextInt();
+		if(num==1){
+			System.out.println("�����û�Ϊ��"+ name[number]);
+		}else{
+			System.out.println("�˳��齱ϵͳ.");
+		}
+	}
+
+}

JavaSE/src/mine/eleven/staticdemo/StaticDemo.java

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+package mine.eleven.staticdemo;
+
+import java.util.Scanner;
+
+public class StaticDemo {
+	private static int count = 0;
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		System.out.println("��ͶƱ: ");
+		Scanner in = new Scanner(System.in);
+		int choice;
+		while(count<=100){
+			System.out.println("��ѯ��ǰƱ�������룺 chaxun\nͶƱ�����룺toupiao");
+			String check = in.nextLine();
+			if("chaxun".equals(check)){
+				System.out.println("��ǰƱ��Ϊ��"+count);
+			}else if("toupiao".equals(check)){
+				System.out.println("��ͶƱ: ");
+				choice = in.nextInt();
+				System.out.println("��лͶƱ��");
+				count++;
+			}else{
+				System.out.println("��Чָ����������룡");
+			}
+		}
+		System.out.println("��ʾͶƱ�ѽ�����");
+	}
+
+}

JavaSE/src/mine/fifteen/zhihuan/ZhiHuan.java

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+package mine.fifteen.zhihuan;
+
+import java.util.Arrays;
+import java.util.Scanner;
+
+public class ZhiHuan {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		System.out.println("������һ������:");
+		Scanner in = new Scanner(System.in);
+		int number = in.nextInt();
+		String number2 = String.valueOf(number);
+		char[] number3 = new char[number2.length()];
+		number3 = number2.toCharArray();
+		char t;
+		for(int i=0; i<(number3.length+1)/2-1; i++){
+			t = number3[number3.length-1-i];
+			number3[number3.length-1-i] = number3[i];
+			number3[i] = t;
+		}
+		number2 = String.valueOf(number3);
+		number = Integer.parseInt(number2);
+		System.out.println(number);
+	}
+
+}

JavaSE/src/mine/five/shopping/Shopping.java

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+package mine.five.shopping;
+
+import java.util.Scanner;
+
+public class Shopping {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		System.out.println("n �˳���\n������ʾ�˵���");
+		Scanner in = new Scanner(System.in);
+
+		String choice = in.next();
+		while((!"n".equals(choice))){	
+			System.out.println("��ӭʹ��Ǭ���̳ǹ���ϵͳ\n"
+					+ "1��T��\t��198.00\n"
+					+ "2������\t��588.88\n"
+					+ "3��ipad\t��2018.18");
+			choice = in.next();
+		}
+		System.out.println("����");
+	}
+
+}

JavaSE/src/mine/four/houchitao/HouZiChiTao.java

@@ -0,0 +1,15 @@
+package mine.four.houchitao;
+
+public class HouZiChiTao {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		int n =1;
+		for(int i=1; i<10; i++){
+			n = 2*(n+1);			
+		}
+		System.out.println(n);
+
+	}
+
+}

JavaSE/src/mine/fourteen/zimu/ZiMu.java

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+package mine.fourteen.zimu;
+
+import java.util.Scanner;
+
+public class ZiMu {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		System.out.println("������һ����ĸ:");
+		Scanner in = new Scanner(System.in);
+		String input = in.nextLine();
+		char[] aCount = input.toCharArray();
+		int count = 0;
+		for(int i=0; i<input.length(); i++){
+			if(aCount[i]=='a'){
+				count++;			
+			}
+		}
+		System.out.println("��ĸa�ĸ���Ϊ:"+count);
+	}
+}

JavaSE/src/mine/nine/tianshu/TianShu.java

@@ -0,0 +1,27 @@
+package mine.nine.tianshu;
+
+import java.util.Scanner;
+
+public class TianShu {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		int[] day = {31,28,31,30,31,30,31,31,30,31,30,31};
+		Scanner in = new Scanner(System.in);
+		System.out.println("year:");
+		int year = in.nextInt();
+		System.out.println("m:");
+		int month = in.nextInt();
+		System.out.println("d:");
+		int date = in.nextInt();
+		if(year%400==0 || (year%4 ==0 && year%100 != 0)){
+			day = new int[]{31,29,31,30,31,30,31,31,30,31,30,31};
+		}
+		int number = 0;
+		for(int i=0; i<month-1; i++){
+			number += day[i];
+		}
+		System.out.println(number+date);
+	}
+
+}

JavaSE/src/mine/one/pingrunnian/PingRunNian.java

@@ -0,0 +1,21 @@
+package mine.one.pingrunnian;
+
+import java.util.Scanner;
+
+public class PingRunNian {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		Scanner in = new Scanner(System.in);
+		System.out.print("year:");
+		int year = in.nextInt();
+		if(year%4 !=0){
+			System.out.println("��������");
+		}else if(year%100 == 0 ){
+			System.out.println("��������");
+		}else{
+			System.out.println("������");
+		}
+	}
+
+}

JavaSE/src/mine/seven/login/Login.java

@@ -0,0 +1,35 @@
+package mine.seven.login;
+
+import java.util.Scanner;
+
+public class Login {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		String username = "Tom";
+		String password = "Tom123";
+
+
+		Scanner in = new Scanner(System.in);
+
+		while(true){
+			System.out.println("�������û�����");
+			String user = in.nextLine();
+			if((!user.equals(username))){
+				System.out.println("�û����������������룺");
+				continue;
+			}
+			System.out.println("���������룺");
+			String pwd = in.nextLine();
+			if((!pwd.equals(password))){
+				System.out.println("����������������룺");
+				continue;
+			}else{
+				System.out.println("��½�ɹ���");
+				break;
+			}
+		}
+
+	}
+
+}