随笔分类 - Java之旅
正式开始学java
摘要：1 package TaskDemos; 2 import java.io.File; 3 import java.io.FileInputStream; 4 import java.io.FileOutputStream; 5 import java.io.ObjectInputStream; 6 import java.io.ObjectOutputStream; 7 import java.io.Serializable; 8 import java.util.Scanner; 9 10 11 class Operate { 12 public stati...
阅读全文
摘要：1 package test; 2 3 import java.util.List; 4 import java.util.ArrayList; 5 import java.util.Collection; 6 7 public class ImplementsDemo { 8 public static void main(String[] args) { 9 List<String> allList=null;10 Collection<String> allCollection=null;11 allList=new Arra...
阅读全文
摘要：1 import java.io.File; 2 import java.io.FileInputStream; 3 import java.io.FileOutputStream; 4 import java.io.OutputStream; 5 import java.io.InputStream; 6 import java.io.ObjectInputStream; 7 import java.io.ObjectOutputStream; 8 import java.io.Serializable; 9 class Person implements Serializable{10 .
阅读全文
摘要：1 import java.io.ByteArrayInputStream; 2 import java.io.IOException; 3 import java.io.PushbackInputStream; 4 5 6 public class PushInputStreamDemo { 7 public static void main(String[] args) throws Exception { 8 String str="www.hjw.com"; 9 ByteArrayInputStream bai=new ByteArrayI...
阅读全文
摘要：1 package hjw; 2 3 import java.util.Scanner; 4 import java.util.Date; 5 import java.text.SimpleDateFormat; 6 import java.text.ParseException; 7 public class ScannerDemo { 8 public static void main(String[] args) { 9 Scanner sc=new Scanner(System.in);10 String str=null;11 Date dt=nu...
阅读全文
摘要：1 package hjw; 2 3 import java.util.Scanner; 4 5 public class ScannerDemo { 6 public static void main(String[] args) { 7 Scanner sc=new Scanner(System.in); 8 int i=0; 9 float f=0.0f;10 System.out.println("输入整数：");11 if(sc.hasNextInt()){//判断输入的是否是整数12 i=sc.nextInt()...
阅读全文
摘要：1 package hjw; 2 import java.io.BufferedReader; 3 import java.io.IOException; 4 import java.io.InputStreamReader; 5 import java.text.ParseException; 6 import java.text.SimpleDateFormat; 7 import java.util.Date; 8 class InputData{ 9 private BufferedReader buf=null;10 public InputData(){11 ...
阅读全文
摘要：1 import java.io.BufferedReader; 2 import java.io.IOException; 3 import java.io.InputStreamReader; 4 public class BufferdReaderDemo1 { 5 public static void main(String[] args) { 6 BufferedReader buf=new BufferedReader(new InputStreamReader(System.in)); 7 String str=null; 8 ...
阅读全文
摘要：1 import java.io.File; 2 import java.io.InputStream; 3 import java.io.PrintStream; 4 public class PrintDemo { 5 public static void main(String[] args) throws Exception{ 6 InputStream ipt=System.in;//通过键盘接收 7 StringBuffer buf=new StringBuffer(); 8 System.out.print("请输入：")...
阅读全文
摘要：1 import java.io.File; 2 import java.io.FileOutputStream; 3 import java.io.PrintStream; 4 public class PrintDemo { 5 public static void main(String[] args) throws Exception{ 6 PrintStream ps=new PrintStream(new FileOutputStream(new File("d:"+File.separator+"te.txt"))); 7 ps.prin.
阅读全文
摘要：1 import java.io.File; 2 import java.io.FileInputStream; 3 import java.io.FileOutputStream; 4 import java.io.InputStream; 5 import java.io.OutputStream; 6 import java.io.IOException; 7 import java.io.FileNotFoundException; 8 public class Copy { 9 public static void main(String[] args) throw...
阅读全文
摘要：1 package hjw; 2 import java.io.IOException; 3 import java.io.PipedInputStream; 4 import java.io.PipedOutputStream; 5 class Send implements Runnable{ 6 private PipedOutputStream pos=null; 7 public Send(){ 8 this.pos=new PipedOutputStream(); 9 }10 public void run(){11 ...
阅读全文
摘要：1 package hjw; 2 import java.io.ByteArrayInputStream; 3 import java.io.ByteArrayOutputStream; 4 import java.io.IOException; 5 //import org.omg.CORBA_2_3.portable.OutputStream; 6 public class dm { 7 public static void main(String[] args) throws Exception { 8 String str="HELLOWORLD"; 9 ...
阅读全文
摘要：1 import java.io.File; 2 import java.io.InputStream; 3 import java.io.FileInputStream; 4 //import org.omg.CORBA_2_3.portable.OutputStream; 5 public class dm { 6 public static void main(String[] args) throws Exception { 7 File f=new File("d:"+File.separator+"te.txt"); 8 InputStre.
阅读全文
摘要：1 package hjw; 2 import java.io.File; 3 import java.io.IOException; 4 public class dm { 5 public static void main(String[] args) { 6 File f=new File("d:"+File.separator); 7 print(f); 8 } 9 public static void print(File file){//递归调用此方法10 if(file!=null){//增加一个检查机制1...
阅读全文
摘要：1 package hjw; 2 import java.io.File; 3 import java.io.IOException; 4 public class dm { 5 public static void main(String[] args) { 6 String path="d:"+File.separator+"te.txt";//拼凑出可以适应操作系统的文件路径 7 File f=new File(path); 8 try{ 9 f.createNewFile();10 }ca...
阅读全文
摘要：1 import java.text.SimpleDateFormat; 2 import java.util.Date; 3 import java.util.TimerTask; 4 public class TimerDemo extends TimerTask{ 5 public void run(){ 6 SimpleDateFormat sdf=null; 7 sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS"); 8 System.out.println(sdf.forma...
阅读全文
摘要：1 import java.util.regex.Matcher; 2 import java.util.regex.Pattern; 3 public class RegexDemo { 4 public static void main(String[] args) { 5 String str="A1B22C333D4444E55555"; 6 String pat="\\d+"; 7 Pattern p=Pattern.compile(pat); 8 Matcher m=p.matcher(str); 9 ...
阅读全文
摘要：1 import java.util.regex.Matcher; 2 import java.util.regex.Pattern; 3 public class RegexDemo { 4 public static void main(String[] args) { 5 String str="2000-11-11"; 6 String pat="\\d{4}-\\d{2}-\\d{2}";//定义替换规则 7 Pattern p=Pattern.compile(pat);//实例化pattern类 8 Matc...
阅读全文
摘要：1 import java.util.Observable; 2 import java.util.Observer; 3 class House extends Observable { 4 private float price; 5 public House(float price){ 6 this.price=price; 7 } 8 public float getPrice(){ 9 return price;10 }11 public void setPrice(float price){12 ...
阅读全文
浙公网安备 33010602011771号