From ae2f628e0c4eb830c94dd3209d57cc1f9e60ee3b Mon Sep 17 00:00:00 2001
From: pareshapraj <72244369+pareshapraj@users.noreply.github.com>
Date: Thu, 7 Oct 2021 14:03:36 +0530
Subject: [PATCH 1/2] Create MyCalculator.java

We can develop calculator in java with the help of AWT/Swing with event handling. Let's see the code of creating calculator in java
---
 MyCalculator.java | 320 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 320 insertions(+)
 create mode 100644 MyCalculator.java

diff --git a/MyCalculator.java b/MyCalculator.java
new file mode 100644
index 0000000..f68cac5
--- /dev/null
+++ b/MyCalculator.java
@@ -0,0 +1,320 @@
+import java.awt.*;  
+import java.awt.event.*;  
+/*********************************************/  
+  
+public class MyCalculator extends Frame  
+{  
+  
+public boolean setClear=true;  
+double number, memValue;  
+char op;  
+  
+String digitButtonText[] = {"7", "8", "9", "4", "5", "6", "1", "2", "3", "0", "+/-", "." };  
+String operatorButtonText[] = {"/", "sqrt", "*", "%", "-", "1/X", "+", "=" };  
+String memoryButtonText[] = {"MC", "MR", "MS", "M+" };  
+String specialButtonText[] = {"Backspc", "C", "CE" };  
+  
+MyDigitButton digitButton[]=new MyDigitButton[digitButtonText.length];  
+MyOperatorButton operatorButton[]=new MyOperatorButton[operatorButtonText.length];  
+MyMemoryButton memoryButton[]=new MyMemoryButton[memoryButtonText.length];  
+MySpecialButton specialButton[]=new MySpecialButton[specialButtonText.length];  
+  
+Label displayLabel=new Label("0",Label.RIGHT);  
+Label memLabel=new Label(" ",Label.RIGHT);  
+  
+final int FRAME_WIDTH=325,FRAME_HEIGHT=325;  
+final int HEIGHT=30, WIDTH=30, H_SPACE=10,V_SPACE=10;  
+final int TOPX=30, TOPY=50;  
+///////////////////////////  
+MyCalculator(String frameText)//constructor  
+{  
+super(frameText);  
+  
+int tempX=TOPX, y=TOPY;  
+displayLabel.setBounds(tempX,y,240,HEIGHT);  
+displayLabel.setBackground(Color.BLUE);  
+displayLabel.setForeground(Color.WHITE);  
+add(displayLabel);  
+  
+memLabel.setBounds(TOPX,  TOPY+HEIGHT+ V_SPACE,WIDTH, HEIGHT);  
+add(memLabel);  
+  
+// set Co-ordinates for Memory Buttons  
+tempX=TOPX;   
+y=TOPY+2*(HEIGHT+V_SPACE);  
+for(int i=0; i<memoryButton.length; i++)  
+{  
+memoryButton[i]=new MyMemoryButton(tempX,y,WIDTH,HEIGHT,memoryButtonText[i], this);  
+memoryButton[i].setForeground(Color.RED);  
+y+=HEIGHT+V_SPACE;  
+}  
+  
+//set Co-ordinates for Special Buttons  
+tempX=TOPX+1*(WIDTH+H_SPACE); y=TOPY+1*(HEIGHT+V_SPACE);  
+for(int i=0;i<specialButton.length;i++)  
+{  
+specialButton[i]=new MySpecialButton(tempX,y,WIDTH*2,HEIGHT,specialButtonText[i], this);  
+specialButton[i].setForeground(Color.RED);  
+tempX=tempX+2*WIDTH+H_SPACE;  
+}  
+  
+//set Co-ordinates for Digit Buttons  
+int digitX=TOPX+WIDTH+H_SPACE;  
+int digitY=TOPY+2*(HEIGHT+V_SPACE);  
+tempX=digitX;  y=digitY;  
+for(int i=0;i<digitButton.length;i++)  
+{  
+digitButton[i]=new MyDigitButton(tempX,y,WIDTH,HEIGHT,digitButtonText[i], this);  
+digitButton[i].setForeground(Color.BLUE);  
+tempX+=WIDTH+H_SPACE;  
+if((i+1)%3==0){tempX=digitX; y+=HEIGHT+V_SPACE;}  
+}  
+  
+//set Co-ordinates for Operator Buttons  
+int opsX=digitX+2*(WIDTH+H_SPACE)+H_SPACE;  
+int opsY=digitY;  
+tempX=opsX;  y=opsY;  
+for(int i=0;i<operatorButton.length;i++)  
+{  
+tempX+=WIDTH+H_SPACE;  
+operatorButton[i]=new MyOperatorButton(tempX,y,WIDTH,HEIGHT,operatorButtonText[i], this);  
+operatorButton[i].setForeground(Color.RED);  
+if((i+1)%2==0){tempX=opsX; y+=HEIGHT+V_SPACE;}  
+}  
+  
+addWindowListener(new WindowAdapter()  
+{  
+public void windowClosing(WindowEvent ev)  
+{System.exit(0);}  
+});  
+  
+setLayout(null);  
+setSize(FRAME_WIDTH,FRAME_HEIGHT);  
+setVisible(true);  
+}  
+//////////////////////////////////  
+static String getFormattedText(double temp)  
+{  
+String resText=""+temp;  
+if(resText.lastIndexOf(".0")>0)  
+    resText=resText.substring(0,resText.length()-2);  
+return resText;  
+}  
+////////////////////////////////////////  
+public static void main(String []args)  
+{  
+new MyCalculator("Calculator - JavaTpoint");  
+}  
+}  
+  
+/*******************************************/  
+  
+class MyDigitButton extends Button implements ActionListener  
+{  
+MyCalculator cl;  
+  
+//////////////////////////////////////////  
+MyDigitButton(int x,int y, int width,int height,String cap, MyCalculator clc)  
+{  
+super(cap);  
+setBounds(x,y,width,height);  
+this.cl=clc;  
+this.cl.add(this);  
+addActionListener(this);  
+}  
+////////////////////////////////////////////////  
+static boolean isInString(String s, char ch)  
+{  
+for(int i=0; i<s.length();i++) if(s.charAt(i)==ch) return true;  
+return false;  
+}  
+/////////////////////////////////////////////////  
+public void actionPerformed(ActionEvent ev)  
+{  
+String tempText=((MyDigitButton)ev.getSource()).getLabel();  
+  
+if(tempText.equals("."))  
+{  
+ if(cl.setClear)   
+    {cl.displayLabel.setText("0.");cl.setClear=false;}  
+ else if(!isInString(cl.displayLabel.getText(),'.'))  
+    cl.displayLabel.setText(cl.displayLabel.getText()+".");  
+ return;  
+}  
+  
+int index=0;  
+try{  
+        index=Integer.parseInt(tempText);  
+    }catch(NumberFormatException e){return;}  
+  
+if (index==0 && cl.displayLabel.getText().equals("0")) return;  
+  
+if(cl.setClear)  
+            {cl.displayLabel.setText(""+index);cl.setClear=false;}  
+else  
+    cl.displayLabel.setText(cl.displayLabel.getText()+index);  
+}//actionPerformed  
+}//class defination  
+  
+/********************************************/  
+  
+class MyOperatorButton extends Button implements ActionListener  
+{  
+MyCalculator cl;  
+  
+MyOperatorButton(int x,int y, int width,int height,String cap, MyCalculator clc)  
+{  
+super(cap);  
+setBounds(x,y,width,height);  
+this.cl=clc;  
+this.cl.add(this);  
+addActionListener(this);  
+}  
+///////////////////////  
+public void actionPerformed(ActionEvent ev)  
+{  
+String opText=((MyOperatorButton)ev.getSource()).getLabel();  
+  
+cl.setClear=true;  
+double temp=Double.parseDouble(cl.displayLabel.getText());  
+  
+if(opText.equals("1/x"))  
+    {  
+    try  
+        {double tempd=1/(double)temp;  
+        cl.displayLabel.setText(MyCalculator.getFormattedText(tempd));}  
+    catch(ArithmeticException excp)  
+                        {cl.displayLabel.setText("Divide by 0.");}  
+    return;  
+    }  
+if(opText.equals("sqrt"))  
+    {  
+    try  
+        {double tempd=Math.sqrt(temp);  
+        cl.displayLabel.setText(MyCalculator.getFormattedText(tempd));}  
+            catch(ArithmeticException excp)  
+                    {cl.displayLabel.setText("Divide by 0.");}  
+    return;  
+    }  
+if(!opText.equals("="))  
+    {  
+    cl.number=temp;  
+    cl.op=opText.charAt(0);  
+    return;  
+    }  
+// process = button pressed  
+switch(cl.op)  
+{  
+case '+':  
+    temp+=cl.number;break;  
+case '-':  
+    temp=cl.number-temp;break;  
+case '*':  
+    temp*=cl.number;break;  
+case '%':  
+    try{temp=cl.number%temp;}  
+    catch(ArithmeticException excp)  
+        {cl.displayLabel.setText("Divide by 0."); return;}  
+    break;  
+case '/':  
+    try{temp=cl.number/temp;}  
+        catch(ArithmeticException excp)  
+                {cl.displayLabel.setText("Divide by 0."); return;}  
+    break;  
+}//switch  
+  
+cl.displayLabel.setText(MyCalculator.getFormattedText(temp));  
+//cl.number=temp;  
+}//actionPerformed  
+}//class  
+  
+/****************************************/  
+  
+class MyMemoryButton extends Button implements ActionListener  
+{  
+MyCalculator cl;  
+  
+/////////////////////////////////  
+MyMemoryButton(int x,int y, int width,int height,String cap, MyCalculator clc)  
+{  
+super(cap);  
+setBounds(x,y,width,height);  
+this.cl=clc;  
+this.cl.add(this);  
+addActionListener(this);  
+}  
+////////////////////////////////////////////////  
+public void actionPerformed(ActionEvent ev)  
+{  
+char memop=((MyMemoryButton)ev.getSource()).getLabel().charAt(1);  
+  
+cl.setClear=true;  
+double temp=Double.parseDouble(cl.displayLabel.getText());  
+  
+switch(memop)  
+{  
+case 'C':   
+    cl.memLabel.setText(" ");cl.memValue=0.0;break;  
+case 'R':   
+    cl.displayLabel.setText(MyCalculator.getFormattedText(cl.memValue));break;  
+case 'S':  
+    cl.memValue=0.0;  
+case '+':   
+    cl.memValue+=Double.parseDouble(cl.displayLabel.getText());  
+    if(cl.displayLabel.getText().equals("0") || cl.displayLabel.getText().equals("0.0")  )  
+        cl.memLabel.setText(" ");  
+    else   
+        cl.memLabel.setText("M");     
+    break;  
+}//switch  
+}//actionPerformed  
+}//class  
+  
+/*****************************************/  
+  
+class MySpecialButton extends Button implements ActionListener  
+{  
+MyCalculator cl;  
+  
+MySpecialButton(int x,int y, int width,int height,String cap, MyCalculator clc)  
+{  
+super(cap);  
+setBounds(x,y,width,height);  
+this.cl=clc;  
+this.cl.add(this);  
+addActionListener(this);  
+}  
+//////////////////////  
+static String backSpace(String s)  
+{  
+String Res="";  
+for(int i=0; i<s.length()-1; i++) Res+=s.charAt(i);  
+return Res;  
+}  
+  
+//////////////////////////////////////////////////////////  
+public void actionPerformed(ActionEvent ev)  
+{  
+String opText=((MySpecialButton)ev.getSource()).getLabel();  
+//check for backspace button  
+if(opText.equals("Backspc"))  
+{  
+String tempText=backSpace(cl.displayLabel.getText());  
+if(tempText.equals(""))   
+    cl.displayLabel.setText("0");  
+else   
+    cl.displayLabel.setText(tempText);  
+return;  
+}  
+//check for "C" button i.e. Reset  
+if(opText.equals("C"))   
+{  
+cl.number=0.0; cl.op=' '; cl.memValue=0.0;  
+cl.memLabel.setText(" ");  
+}  
+  
+//it must be CE button pressed  
+cl.displayLabel.setText("0");cl.setClear=true;  
+}//actionPerformed  
+}//class  
+  

From 19fc7075140d0871353112ac4a54e70bf6bccc56 Mon Sep 17 00:00:00 2001
From: pareshapraj <72244369+pareshapraj@users.noreply.github.com>
Date: Tue, 12 Oct 2021 22:14:50 +0530
Subject: [PATCH 2/2] Create OnlineTest.java

---
 OnlineTest.java | 187 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 187 insertions(+)
 create mode 100644 OnlineTest.java

diff --git a/OnlineTest.java b/OnlineTest.java
new file mode 100644
index 0000000..1c89a8d
--- /dev/null
+++ b/OnlineTest.java
@@ -0,0 +1,187 @@
+/*Online Java Paper Test*/  
+  
+import java.awt.*;  
+import java.awt.event.*;  
+import javax.swing.*;  
+  
+class OnlineTest extends JFrame implements ActionListener  
+{  
+    JLabel l;  
+    JRadioButton jb[]=new JRadioButton[5];  
+    JButton b1,b2;  
+    ButtonGroup bg;  
+    int count=0,current=0,x=1,y=1,now=0;  
+    int m[]=new int[10];      
+    OnlineTest(String s)  
+    {  
+        super(s);  
+        l=new JLabel();  
+        add(l);  
+        bg=new ButtonGroup();  
+        for(int i=0;i<5;i++)  
+        {  
+            jb[i]=new JRadioButton();     
+            add(jb[i]);  
+            bg.add(jb[i]);  
+        }  
+        b1=new JButton("Next");  
+        b2=new JButton("Bookmark");  
+        b1.addActionListener(this);  
+        b2.addActionListener(this);  
+        add(b1);add(b2);  
+        set();  
+        l.setBounds(30,40,450,20);  
+        jb[0].setBounds(50,80,100,20);  
+        jb[1].setBounds(50,110,100,20);  
+        jb[2].setBounds(50,140,100,20);  
+        jb[3].setBounds(50,170,100,20);  
+        b1.setBounds(100,240,100,30);  
+        b2.setBounds(270,240,100,30);  
+        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
+        setLayout(null);  
+        setLocation(250,100);  
+        setVisible(true);  
+        setSize(600,350);  
+    }  
+    public void actionPerformed(ActionEvent e)  
+    {  
+        if(e.getSource()==b1)  
+        {  
+            if(check())  
+                count=count+1;  
+            current++;  
+            set();    
+            if(current==9)  
+            {  
+                b1.setEnabled(false);  
+                b2.setText("Result");  
+            }  
+        }  
+        if(e.getActionCommand().equals("Bookmark"))  
+        {  
+            JButton bk=new JButton("Bookmark"+x);  
+            bk.setBounds(480,20+30*x,100,30);  
+            add(bk);  
+            bk.addActionListener(this);  
+            m[x]=current;  
+            x++;  
+            current++;  
+            set();    
+            if(current==9)  
+                b2.setText("Result");  
+            setVisible(false);  
+            setVisible(true);  
+        }  
+        for(int i=0,y=1;i<x;i++,y++)  
+        {  
+        if(e.getActionCommand().equals("Bookmark"+y))  
+        {  
+            if(check())  
+                count=count+1;  
+            now=current;  
+            current=m[y];  
+            set();  
+            ((JButton)e.getSource()).setEnabled(false);  
+            current=now;  
+        }  
+        }  
+      
+        if(e.getActionCommand().equals("Result"))  
+        {  
+            if(check())  
+                count=count+1;  
+            current++;  
+            //System.out.println("correct ans="+count);  
+            JOptionPane.showMessageDialog(this,"correct ans="+count);  
+            System.exit(0);  
+        }  
+    }  
+    void set()  
+    {  
+        jb[4].setSelected(true);  
+        if(current==0)  
+        {  
+            l.setText("Que1: Which one among these is not a primitive datatype?");  
+            jb[0].setText("int");jb[1].setText("Float");jb[2].setText("boolean");jb[3].setText("char");   
+        }  
+        if(current==1)  
+        {  
+            l.setText("Que2: Which class is available to all the class automatically?");  
+            jb[0].setText("Swing");jb[1].setText("Applet");jb[2].setText("Object");jb[3].setText("ActionEvent");  
+        }  
+        if(current==2)  
+        {  
+            l.setText("Que3: Which package is directly available to our class without importing it?");  
+            jb[0].setText("swing");jb[1].setText("applet");jb[2].setText("net");jb[3].setText("lang");  
+        }  
+        if(current==3)  
+        {  
+            l.setText("Que4: String class is defined in which package?");  
+            jb[0].setText("lang");jb[1].setText("Swing");jb[2].setText("Applet");jb[3].setText("awt");  
+        }  
+        if(current==4)  
+        {  
+            l.setText("Que5: Which institute is best for java coaching?");  
+            jb[0].setText("Utek");jb[1].setText("Aptech");jb[2].setText("SSS IT");jb[3].setText("jtek");  
+        }  
+        if(current==5)  
+        {  
+            l.setText("Que6: Which one among these is not a keyword?");  
+            jb[0].setText("class");jb[1].setText("int");jb[2].setText("get");jb[3].setText("if");  
+        }  
+        if(current==6)  
+        {  
+            l.setText("Que7: Which one among these is not a class? ");  
+            jb[0].setText("Swing");jb[1].setText("Actionperformed");jb[2].setText("ActionEvent");  
+                        jb[3].setText("Button");  
+        }  
+        if(current==7)  
+        {  
+            l.setText("Que8: which one among these is not a function of Object class?");  
+            jb[0].setText("toString");jb[1].setText("finalize");jb[2].setText("equals");  
+                        jb[3].setText("getDocumentBase");         
+        }  
+        if(current==8)  
+        {  
+            l.setText("Que9: which function is not present in Applet class?");  
+            jb[0].setText("init");jb[1].setText("main");jb[2].setText("start");jb[3].setText("destroy");  
+        }  
+        if(current==9)  
+        {  
+            l.setText("Que10: Which one among these is not a valid component?");  
+            jb[0].setText("JButton");jb[1].setText("JList");jb[2].setText("JButtonGroup");  
+                        jb[3].setText("JTextArea");  
+        }  
+        l.setBounds(30,40,450,20);  
+        for(int i=0,j=0;i<=90;i+=30,j++)  
+            jb[j].setBounds(50,80+i,200,20);  
+    }  
+    boolean check()  
+    {  
+        if(current==0)  
+            return(jb[1].isSelected());  
+        if(current==1)  
+            return(jb[2].isSelected());  
+        if(current==2)  
+            return(jb[3].isSelected());  
+        if(current==3)  
+            return(jb[0].isSelected());  
+        if(current==4)  
+            return(jb[2].isSelected());  
+        if(current==5)  
+            return(jb[2].isSelected());  
+        if(current==6)  
+            return(jb[1].isSelected());  
+        if(current==7)  
+            return(jb[3].isSelected());  
+        if(current==8)  
+            return(jb[1].isSelected());  
+        if(current==9)  
+            return(jb[2].isSelected());  
+        return false;  
+    }  
+    public static void main(String s[])  
+    {  
+        new OnlineTest("Online Test Of Java");  
+    }  
+}