2017.3

Author: bebory

Diff for: GUI/draw.java

@@ -0,0 +1,15 @@
+import java.awt.Graphics;
+import javax.swing.JPanel;
+public class draw extends JPanel{
+	public void paintComponent(Graphics g)
+	{
+		super.paintComponent(g);
+		
+		int width = getWidth();
+		int height= getHeight();
+		
+		g.drawLine(0, 0, width, height);
+		g.drawLine(0, height, width,0);
+	}
+	
+}

Diff for: GUI/drawTest.java

@@ -0,0 +1,13 @@
+import javax.swing.JFrame;
+public class drawTest {
+	public static void main(String[] args)
+	{
+		draw panel=new draw();
+		JFrame application = new JFrame();
+		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+		application.add(panel);
+		application.setSize(650, 650);
+		application.setVisible(true);
+	}
+
+}

Diff for: IO.java

@@ -0,0 +1,67 @@
+package 实验一;
+import java.util.*;
+import java.io.*;
+public class IO {
+	public static void main(String[] args) throws IOException
+	{
+		
+        //way1：use Scanner to input
+		Scanner  input=new Scanner(System.in);
+		System.out.print("输入一个字符串和数字:");
+		String a=input.next();
+		int number=input.nextInt();
+		
+		//way2:use BufferedReader and System.in to input
+		System.out.print("输入一个字符串和数字:");
+		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
+		String b;
+		b=br.readLine();
+		int s;
+		s =Integer.parseInt(br.readLine());
+		
+		
+		//two ways to output
+		System.out.print(a);
+		System.out.println(number);
+		System.out.print(b);
+		System.out.println(s);
+//		PrintStream out = new PrintStream( new BufferedOutputStream(System.out)); 
+//		out.print(s);
+		
+		
+		//题目二
+		String s1,s2;
+		s1=s2=null;
+		int num1,num2;
+		
+		System.out.print("Please input two number:");
+		s1=br.readLine();
+		s2=br.readLine();
+		if(s1.length()==0||s2.length()==0) 
+		{
+			System.out.print("erro!");
+			return;
+		}                                               //有空字符串报错	
+		for(int i=0;i<s1.length();i++)
+		{
+			if(s1.charAt(i)>'9'||s1.charAt(i)<'0')
+			{
+				System.out.print("erro!");
+				return;
+			}
+		}
+		for(int i=0;i<s2.length();i++)
+		{
+			if(s2.charAt(i)>'9'||s2.charAt(i)<'0')
+			{
+				System.out.print("erro!");
+				return;
+			}
+		}                                               //只要s1,s2中有非数字的字符就报错退出
+		num1=Integer.parseInt(s1);
+		num2=Integer.parseInt(s2);                      //若没问题，则转为数字
+		System.out.print("The average of the two numbers is: ");
+		System.out.print((num1+num2)/2);
+	}
+
+}