?? 第二十六章例子.txt
字號:
26-例子1
import java.util.*;
public class LinkListOne
{public static void main(String args[])
{ LinkedList mylist=new LinkedList();
mylist.add("It"); //鏈表中的第一個節點。
mylist.add("is"); //鏈表中的第二個節點。
mylist.add("a"); //鏈表中的第三個節點。
mylist.add("door"); //鏈表中的第四個節點。
int number=mylist.size(); //獲取鏈表的長度。
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"節點中的數據:"+temp);
}
}
}
26-例子2
import java.util.*;
public class LinkListTwo
{public static void main(String args[])
{ LinkedList mylist=new LinkedList();
mylist.add("is"); mylist.add("a");
int number=mylist.size();
System.out.println("現在鏈表中有"+number+"個節點:");
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"節點中的數據:"+temp);
}
mylist.addFirst("It");mylist.addLast("door");
number=mylist.size();
System.out.println("現在鏈表中有"+number+"個節點:");
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"節點中的數據:"+temp);
}
mylist.remove(0);mylist.remove(1);
mylist.set(0,"open");
number=mylist.size();
System.out.println("現在鏈表中有"+number+"個節點:");
for(int i=0;i<number;i++)
{String temp=(String)mylist.get(i);
System.out.println("第"+i+"節點中的數據:"+temp);
}
}
}
26-例子3
import java.util.*;
class Student
{String name ;int number;float score;
Student(String name,int number,float score)
{this.name=name;this.number=number;this.score=score;
}
}
public class LinkListThree
{public static void main(String args[])
{ LinkedList mylist=new LinkedList();
Student stu_1=new Student("趙好民" ,9012,80.0f),
stu_2=new Student("錢小青" ,9013,90.0f),
stu_3=new Student("孫力枚" ,9014,78.0f),
stu_4=new Student("周左右" ,9015,55.0f);
mylist.add(stu_1); mylist.add(stu_2);
mylist.add(stu_3); mylist.add(stu_4);
Iterator iter=mylist.iterator();
while(iter.hasNext())
{ Student te=(Student)iter.next();
System.out.println(te.name+" "+te.number+" "+te.score);
}
}
}
26-例子4
import java.util.*;import java.awt.event.*;import java.awt.*;
import javax.swing.*;import java.io.*;
class 商品 extends Panel
{String 代號,名稱;int 庫存;float 單價;
商品(String 代號,String 名稱,int 庫存,float 單價)
{this.代號=代號;this.名稱=名稱;this.庫存=庫存;this.單價=單價;
}
}
class ShowWin extends JFrame implements ActionListener
{ LinkedList goods_list=null;
JTextField 代號文本框=new JTextField(),
名稱文本框=new JTextField(),
庫存文本框=new JTextField(),
單價文本框=new JTextField(),
刪除文本框=new JTextField();
JButton b_add=new JButton("添加商品"),
b_del=new JButton("刪除商品"),
b_show =new JButton("顯示商品清單");
JTextArea 顯示區=new JTextArea();
ShowWin()
{goods_list=new LinkedList();
Container con=getContentPane();
JScrollPane pane=new JScrollPane(顯示區);
顯示區.setEditable(false);
JPanel save=new JPanel();save.setLayout(new GridLayout(5,2));
save.add(new Label("輸入代號:"));save.add(代號文本框);
save.add(new Label("輸入名稱:"));save.add(名稱文本框);
save.add(new Label("輸入庫存:"));save.add(庫存文本框);
save.add(new Label("輸入單價:"));save.add(單價文本框);
save.add(new Label("點擊添加:"));save.add(b_add);
JPanel del=new JPanel();del.setLayout(new GridLayout(2,2));
del.add(new Label("輸入刪除的代號:"));del.add(刪除文本框);
del.add(new Label("點擊刪除:"));del.add(b_del);
JPanel show=new JPanel();show.setLayout(new BorderLayout());
show.add(pane,BorderLayout.CENTER);show.add(b_show,BorderLayout.SOUTH);
JSplitPane split_one,split_two;
split_one=new JSplitPane(JSplitPane.VERTICAL_SPLIT,save,del);
split_two=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,split_one,show);
con.add(split_two,BorderLayout.CENTER);
b_add.addActionListener(this);b_del.addActionListener(this);
b_show.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==b_add)
{String daihao=null,mingcheng=null;int kucun=0;float danjia=0.0f;
daihao=代號文本框.getText();mingcheng=名稱文本框.getText();
kucun=Integer.parseInt(庫存文本框.getText());
danjia=Float.valueOf(單價文本框.getText()).floatValue();
商品 goods=new 商品(daihao,mingcheng,kucun,danjia);
goods_list.add(goods);
try {FileOutputStream file=new FileOutputStream("goods.txt");
ObjectOutputStream out=new ObjectOutputStream(file);
out.writeObject(goods_list);out.close();
}
catch(IOException event){}
}
else if(e.getSource()==b_del)
{String daihao=刪除文本框.getText();
try {FileInputStream come_in=new FileInputStream("goods.txt");
ObjectInputStream in=new ObjectInputStream(come_in);
goods_list=(LinkedList)in.readObject();in.close();
}
catch(ClassNotFoundException event){}
catch(IOException event){}
int number=goods_list.size();
for(int i=0;i<number;i++)
{商品 temp=(商品)goods_list.get(i);
if(temp.代號.equals(daihao)) {goods_list.remove(i);}
try {FileOutputStream file=new FileOutputStream("goods.txt");
ObjectOutputStream out=new ObjectOutputStream(file);
out.writeObject(goods_list);
out.close();
}
catch(IOException event){}
}
}
else if(e.getSource()==b_show)
{ 顯示區.setText(null);
try {FileInputStream come_in=new FileInputStream("goods.txt");
ObjectInputStream in=new ObjectInputStream(come_in);
goods_list=(LinkedList)in.readObject();
}
catch(ClassNotFoundException event){}
catch(IOException event){}
Iterator iter=goods_list.iterator();
while(iter.hasNext())
{ 商品 te=(商品)iter.next();
顯示區.append("商品代號:"+te.代號+" ");
顯示區.append("商品名稱:"+te.名稱+" ");
顯示區.append("商品庫存:"+te.庫存+" ");
顯示區.append("商品單價:"+te.單價+" ");
顯示區.append("\n");
}
}
}
}
public class LinkListFour
{public static void main(String args[])
{ ShowWin win=new ShowWin();
win.setSize(100,100);
win.setVisible(true);
win.addWindowListener(new WindowAdapter()
{public void windowClosing(WindowEvent e)
{System.exit(0);}});
}
}
26-例子5
import java.util.*;
class StackOne
{public static void main(String args[])
{Stack mystack=new Stack();
mystack.push(new Integer(1)); mystack.push(new Integer(2));
mystack.push(new Integer(3)); mystack.push(new Integer(4));
mystack.push(new Integer(5)); mystack.push(new Integer(6));
while(!(mystack.empty()))
{Integer temp=(Integer)mystack.pop();
System.out.print(" "+temp.toString());}
}
}
輸出結果是：6 5 4 3 2 1
26-例子6
import java.util.*;
class StackTwo
{public static void main(String args[])
{Stack mystack=new Stack();
mystack.push(new Integer(1)); mystack.push(new Integer(1));
int k=1;
while(k<=10)
for(int i=1;i<=2;i++)
{Integer F1=(Integer)mystack.pop();int f1=F1.intValue();
Integer F2=(Integer)mystack.pop();int f2=F2.intValue();
Integer temp=new Integer(f1+f2);
System.out.println(""+temp.toString());
mystack.push(temp);mystack.push(F2);k++;
}
}
}
26-例子7
import java.util.*;
class TreeOne
{public static void main(String args[])
{ TreeSet mytree=new TreeSet();
mytree.add("boy");mytree.add("zoo");
mytree.add("apple"); mytree.add("girl");
Iterator te=mytree.iterator();
while(te.hasNext())
System.out.println(""+te.next());
}
}
輸出結果是：
apple
boy
girl
zoo
26-例子8
import java.util.*;import java.awt.*;
class TreeTwo
{public static void main(String args[])
{ TreeSet mytree=new TreeSet(new Comparator()
{public int compare(Object a,Object b)
{Student stu1=(Student)a;Student stu2=(Student)b;
return stu1.compareTo(stu2);}
});
Student st1,st2,st3,st4;
st1=new Student(90,"zhan ying");st2=new Student(66,"wang heng");
st3=new Student(86,"Liuh qing");st4=new Student(76,"yage ming");
mytree.add(st1);mytree.add(st2);mytree.add(st3);mytree.add(st4);
Iterator te=mytree.iterator();
while(te.hasNext())
{Student stu=(Student)te.next();
System.out.println(""+stu.name+" "+stu.english);}
}
}
class Student implements Comparable
{ int english=0;String name;
Student(int e,String n)
{english=e;name=n;
}
public int compareTo(Object b)
{ Student st=(Student)b;
return (this.english-st.english);
}
}
輸出結果是：
wang heng 66
yage ming 76
liuhe qing 86
zhan ying 90
26-例子9
import java.util.*;import java.awt.event.*;
import java.awt.*;
class 節目 implements Comparable
{String name;double time;
節目(String 名稱,double 演出時間)
{name=名稱;time=演出時間;
}
public int compareTo(Object b)
{節目 item=(節目)b;
return (int)((this.time-item.time)*1000);
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