Slip 4 A) Write a java program to display alternate character from a given string.
Answer :
import
java.io.DataInputStream;
class Slip4A
{
public static void main(String args[]){
DataInputStream dr = new DataInputStream(System.in);
try {
System.out.print("Enter String :
");
String str = dr.readLine();
for(int i=0;i<str.length();i+=2) {
System.out.print(" "
+ str.charAt(i));
}
} catch (Exception e) {}
}
}
Output :
Slip 4 B) Write a java program using Applet to implement a simple arithmetic calculator.
Answer :
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Slip4B extends Applet implements ActionListener {
Button b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14, b15, b16;
String s1 = "", s2;
Frame f;
Panel p2;
TextField t;
int n1, n2;
public void init(){
setLayout(new BorderLayout());
Frame title = (Frame) this.getParent().getParent();
title.setTitle("Simple Calc");
t = new TextField();
p2 = new Panel();
p2.setLayout(new GridLayout(6, 4, 2, 1));
p2.setFont( new Font("Times New Roman",Font.BOLD,15));
b1 = new Button("1");
b1.addActionListener(this);
b2 = new Button("2");
b2.addActionListener(this);
b3 = new Button("3");
b3.addActionListener(this);
b4 = new Button("+");
b4.addActionListener(this);
b5 = new Button("4");
b5.addActionListener(this);
b6 = new Button("5");
b6.addActionListener(this);
b7 = new Button("6");
b7.addActionListener(this);
b8 = new Button("-");
b8.addActionListener(this);
b9 = new Button("7");
b9.addActionListener(this);
b10 = new Button("8");
b10.addActionListener(this);
b11 = new Button("9");
b11.addActionListener(this);
b12 = new Button("*");
b12.addActionListener(this);
b13 = new Button("Clear");
b13.addActionListener(this);
b14 = new Button("0");
b14.addActionListener(this);
b15 = new Button("/");
b15.addActionListener(this);
b16 = new Button("=");
b16.addActionListener(this);
add(t, "North");
p2.add(b9);
p2.add(b10);
p2.add(b11);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.add(b7);
p2.add(b8);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p2.add(b12);
p2.add(new Label(""));
p2.add(b14);
p2.add(new Label(""));
p2.add(b15);
p2.add(new Label(""));
p2.add(new Label(""));
p2.add(new Label(""));
p2.add(b16);
add(p2);
p2.add(new Label(""));
p2.add(b13);
}
public void actionPerformed(ActionEvent e1){
String str = e1.getActionCommand();
if (str.equals("+") || str.equals("-") || str.equals("*") || str.equals("/")){
String str1 = t.getText();
s2 = str;
n1 = Integer.parseInt(str1);
s1 = "";
}else if (str.equals("=")){
String str2 = t.getText();
n2 = Integer.parseInt(str2);
int sum = 0;
if (s2 == "+")
sum = n1 + n2;
else if (s2 == "-")
sum = n1 - n2;
else if (s2 == "*")
sum = n1 * n2;
else if (s2 == "/")
sum = n1 / n2;
String str1 = String.valueOf(sum);
t.setText("" + str1);
s1 = "";
}else if (str.equals("Clear")){
t.setText("");
}else{
s1 += str;
t.setText("" + s1);
}
}
}
/*
* <applet code="Slip4B" height=250 width=250>
*
* </applet>
*/
Output :
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