java.4.txt

《Java就业培训教程》 作者：张孝祥 书中原代码 《Java就业培训教程》P34的Java原代码

《Java就业培训教程》P218源码
程序清单：ReadLine.java
public class ReadLine
{
	public static void main(String [] args)
	{
		byte buf[]=new byte[1024];
		String strInfo=null;
		int pos=0;
		int ch=0;
		System.out.println("please enter info, input bye for exit:");
		while(true)
		{
			try
			{            
				ch=System.in.read();
			}
			catch(Exception e)
			{
				System.out.println(e.getMessage());
			}
			switch(ch)
			{
				case '\r':
					break;
				case '\n':
					strInfo= new String(buf,0,pos);
					if(strInfo == "bye")
						return ;
					else
						System.out.println(strInfo);
						pos=0;
						break;
				default:
					buf[pos++]=(byte)ch;
			}
		}
	}
}

《Java就业培训教程》P221源码
程序清单：TestInteger.java
class TestInteger
{
	public static void main(String[] args)
	{
		int w = Integer.parseInt(args[0]);  //第一种方法
		int h = new  Integer(args[1]).intValue(); //第二种方法
		//int h = Integer.valueOf(args[1]).intValue(); //第三种方法
		for(int i=0;i<h;i++)
		{
		StringBuffer sb=new StringBuffer();
		for(int j=0 ;j<w;j++)
		{
			sb.append('*');
		}
		System.out.println(sb.toString());
		}
	}
}

《Java就业培训教程》P223源码
程序清单：TestVector.java
import java.util.*;  //下面用到的Vector类和Enumeration接口都在此包中
public class TestVector
{
	public static void main(String [] args)
	{
		int b=0;
		Vector v=new Vector();
		System.out.println("Please Enter Number:");
		while(true)
		{
			try
			{
				b= System.in.read();
			}
           	catch(Exception e)
			{
				System.out.println(e.getMessage());
			}
			if(b=='\r' || b== '\n')
				break;
			else
			{
				int num=b-'0';
				v.addElement(new Integer(num));
			}
		}
		int sum=0;
		Enumeration e=v.elements();    
		while(e.hasMoreElements())
		{
			Integer intObj=(Integer)e.nextElement();
			sum += intObj.intValue();
		}
		System.out.println(sum);
	}
}

《Java就业培训教程》P225源码
程序清单：TestCollection.java
import java.util.*;  //ArrayList类和Iterator接口都在此包中
public class TestCollection
{
	public static void main(String [] args)
	{
        int b=0;
		ArrayList al=new ArrayList();
		System.out.println("Please Enter Number:");
		while(true)
		{
			try
			{
			   b= System.in.read();
			}
			catch(Exception e)
			{
    			System.out.println(e.getMessage());
			}
			if(b=='\r' | b== '\n')
				break;
			else
			{
				int num=b-'0';
				al.add(new Integer(num));
			}
		}
		int sum=0;
		Iterator itr=al.iterator();
		while(itr.hasNext())
		{
			Integer intObj=(Integer)itr.next();
			sum += intObj.intValue();
		}
		System.out.println(sum);
	}
}


《Java就业培训教程》P227源码
程序清单：TestSort.java
import java.util.*;
public class TestSort
{
	public static void main(String[] args)
	{
		ArrayList al=new ArrayList();
		al.add(new Integer(1));
		al.add(new Integer(3));
		al.add(new Integer(2));
		System.out.println(al.toString()); //排序前
		Collections.sort(al); 
		System.out.println(al.toString()); //排序后
	}
}

《Java就业培训教程》P228源码
class MyKey
{
	private String name;
	private int age;
	public MyKey(String name,int age)
	{
		this.name = name;
		this.age = age;
	}
	public String toString()
	{
		return new String(name + "," + age);
	}
	public boolean equals(Object obj)
	{
		if(obj instanceof MyKey)
		{
			MyKey objTemp = (MyKey)obj;
			if(name.equals(objTemp.name) && age==objTemp.age)
			{
				return true;
			}
			else
			{
				return false;
			}
		}
		//假如obj不是MyKey类的实例对象，它就不可能与当前对象相等了
		else 
		{
			return false;
		}
	}
	public int hashCode()
	{
		return name.hashCode() + age;
	}
}

《Java就业培训教程》P229源码
程序清单：HashtableTest.java
import java.util.*;
public class HashtableTest
{
	public static void main(String[] args)
	{
		Hashtable numbers=new Hashtable();
		numbers.put(new MyKey("zhangsan",18),new Integer(1));
		numbers.put(new MyKey("lisi",15),new Integer(2));
		numbers.put(new MyKey("wangwu",20),new Integer(3));
		Enumeration e=numbers.keys();
		while(e.hasMoreElements())
		{
			MyKey key=(MyKey)e.nextElement();
			System.out.print(key.toString()+"=");
			System.out.println(numbers.get(key).toString());
		}
	}
}
《Java就业培训教程》P231源码
程序清单：PropertiesFile.java
import java.util.*;
import java.io.*;
class PropertiesFile
{
	public static void main(String[] args)
	{
		Properties settings=new Properties();
		try
		{
			settings.load(new FileInputStream("c:\\count.txt"));
		}
		catch(Exception e)
		{
			settings.setProperty("Count",new Integer(0).toString());
		}
		int c=Integer.parseInt(settings.getProperty("Count"))+1;
		System.out.println("这是本程序第"+c+"次被使用");
		settings.put("Count",new Integer(c).toString());
		try
		{
			settings.store(new FileOutputStream("c:\\count.txt"),
			"This Program is used:");
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
		}
	}
}
《Java就业培训教程》P233源码
程序清单：TestProperties
import java.util.*;
public class SystemInfo
{
	public static void main(String[] args)
	{
		Properties sp=System.getProperties();
		Enumeration e=sp.propertyNames();
		while(e.hasMoreElements())
		{
			String key=(String)e.nextElement();
			System.out.println(key+" = "+sp.getProperty(key));
		}
	}
}
《Java就业培训教程》P234源码
程序清单：TestRuntime.java
public class TestRuntime
{
	public static void main(String[] args)
	{
		Process p=null; 
        try
		{
			p=Runtime.getRuntime().exec("notepad.exe TestRuntime.java");
       	   	Thread.sleep(5000);
	   	}
	    catch(Exception e)
	    {
	     	System.out.println(e.getMessage());
	    }
	    p.destroy();
	}
}
《Java就业培训教程》P236源码
程序清单：TestDateFormat.java
import java.util.*;
import java.text.*;
public class TestDateFormat 
{
	public static void main(String[] args)
	{
		SimpleDateFormat sdf1=new SimpleDateFormat("yyyy-MM-dd");
		SimpleDateFormat sdf2=new SimpleDateFormat("yyyy年MM月dd日");
		try
		{
			Date d=sdf1.parse("2003-03-15");
			System.out.println(sdf2.format(d));
		}
		catch(Exception e)
		{
			System.out.println(e.getMessage());
		}
	}
}