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Encode Image to BASE64 and Decode it- ANDROID (JAVA)

As of my Personal Experience, I am attaching a Base 64 file with my this post to convert Image to BASE64 and decode back. I have not written this Base 64 file but have taken a reference from other.


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To check number is odd or even without using OPERATOR( C++)

Hint: When we do conversion from decimal to binary then you have noticed that last digit of binary number is '0' if number is even ELSE '1'.
Using same logic we will solve this program.

#include "iostream.h"
#include "conio.h"
void main()
{
int number, last_digit;
cout<<"Enter the Number"; cin>>number;

last_digit=number & 1; //Give the last digit of Binary number

if(last_digit==0)
cout<<"Number is EVEN";

else
cout<<"Number is ODD";
}

To change case of String

INPUT: JavA MaDe eASY

OUTPUT: jAVa mAdE Easy



class StringDemochangecase
{
static String changecase(String s)
{
String s1="";

for(int i=0;i {
char ch;
if(s.charAt(i)<91)
{
int c=s.charAt(i)+32;
ch=(char)c;
}
else
{
int c=s.charAt(i)-32;
ch=(char)c;
}
s1=s1+ch;
}
return s1;
}

public static void main(String args[])
{
String s="JavA MaDe eASY";
String s1=changecase(s);
System.out.println(s1);
}
}

To check whether String is Palindrome or Not

public class StringDemopalindrome
{
static boolean palindrome(String s)
{
String s1="";
int i, flag=0;

for(i=s.length()-1;i>=0;i--)
{
s1=s1+s.charAt(i);
}

for(i=0;i {
if (s.charAt(i)!=s1.charAt(i))
flag =1;
}

if(flag==1)
return false;
else
return true;
}

public static void main(String args[])
{
String s="madam";
boolean b=palindrome(s);
System.out.println(b);
}
}

Calculate Length of String

public class StringDemolength
{
static int length(String s)
{
int i,count=0;
for(i=0;i {
count++;
}
return count;
}

public static void main(String args[])
{
String s="India is a good country";
int count=length(s);
System.out.println(count);
}
}

Print String in Reverse Order

INPUT: INDIA

OUTPUT: AIDNI

public class StringDemoReverse
{
static String reverse(String s)
{
int i;
String s1="";
for(i=s.length()-1;i>=0;i--)
{
s1=s1+s.charAt(i);
}
return s1;
}

public static void main(String args[])
{
String s="India";
String s1=reverse(s);
System.out.println(s1);
}
}

Swap Two Images on button click in JAVA

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MyCanvas extends Canvas
{
Image i,j;
int flag;
MyCanvas()
{
Toolkit t= Toolkit.getDefaultToolkit();
i=t.getImage("f:\\hope.jpg"); //PATH OF FIRST IMAGE
j=t.getImage("f:\\Every_step.jpg"); //PATH OF SECOND IMAGE
}

public void paint(Graphics g)
{
if(flag==0)
{
g.drawImage(i,50,50,this);
g.drawImage(j,300,50,this);
}
if (flag==1)
{
g.drawImage(i,300,50,this);
g.drawImage(j,50,50,this);
}
}
}

class SwapImages implements ActionListener
{
MyCanvas m= new MyCanvas();
JFrame jf;
SwapImages()
{
jf=new JFrame("SWAP IMAGES");
jf.add(m);
JButton button1=new JButton("Swap");
Panel p=new Panel();
p.add(button1);
jf.add(p,BorderLayout.SOUTH);
button1.addActionListener(this);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.setSize(400,400);
jf.setVisible(true);
}

public void actionPerformed(ActionEvent e)
{
if(m.flag==0)
m.flag=1;
else
m.flag=0;
m.repaint();
}

public static void main(String s[])
{
new SwapImages();
}
}

Swap two numbers without using third variable

Example:
Before Swap
number1=45 number2=33

After Swap
number1=33 number2=45



class Swap {
public static void main(String[] args) {
int number1=45,number2=33;
number1 = number1 + number2;
number2 = number1 - number2;
number1 = number1 - number2;
System.out.println("After swapping, number1= " + number1 + " and number2= "
+ number2);
}
}

Summation of elements of upper triangle of matrix

Example:
1 2 3
0 4 5
0 0 6
public class arraydemotriangleBsum {

static void triangleBsum(int x[][])
{
int i,j,c=0;
for(i=0;i<3;i++) { for(j=0;j<3;j++) { if(i>=j)
{
c=c+x[i][j];
}
}
}
System.out.println("The Sum of triangle B is:"+c);
}
public static void main(String[] args)
{
triangleBsum(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

To find minimum number in upper triangle of matrix

Example:
1 2 3
0 4 5
0 0 6

public class arraydemotriangleBmin {

static void triangleBmin(int x[][])
{
int i,j,min=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{min=x[0][0];

if(i<=j)
{

if(x[i][j] {
min=x[i][j];
}
}
}
}
System.out.println("The Min Value in triangle B is:"+ min);
}
public static void main(String[] args)
{
triangleBmin(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

To find maximum number in upper triangle of matrix

Example:
1 2 3
0 4 5
0 0 6

public class arraydemotriangleBmax {

static void triangleBmax(int x[][])
{
int i,j,max=0;
for(i=0;i<3;i++) { for(j=0;j<3;j++) {max=x[0][0]; if(i<=j) { if(x[i][j]>max)
{
max=x[i][j];
}
}
}
}
System.out.println("The Max Value in triangle B is:"+ max);
}
public static void main(String[] args)
{
triangleBmax(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

Summation of elements of lower triangle of matrix

Example:
1 0 0
2 3 0
4 5 6
public class arraydemotriangleAsum {

static void triangleAsum(int x[][])
{
int i,j,c=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
if(i<=j)
{
c=c+x[i][j];
}
}
}
System.out.println("The Sum of triangle A is:"+c);
}
public static void main(String[] args)
{
triangleAsum(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

To find minimum number in lower triangle of matrix

Example:
1 0 0
2 3 0
4 5 6


public class arraydemotriangleAmin {

static void triangleAmin(int x[][])
{
int i,j,min=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{min=x[0][0];

if(i<=j)
{

if(x[i][j] {
min=x[i][j];
}
}
}
}
System.out.println("The Min Value in triangle A is:"+ min);
}
public static void main(String[] args)
{
triangleAmin(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

To find maximum number in lower triangle of matrix

Example:
1 0 0
2 3 0
4 5 6


public class arraydemotriangleAmax {

static void triangleAmax(int x[][])
{
int i,j,max=0;
for(i=0;i<3;i++) { for(j=0;j<3;j++) {max=x[0][0]; if(i<=j) { if(x[i][j]>max)
{
max=x[i][j];
}
}
}
}
System.out.println("The Max Value in triangle A is:"+ max);
}
public static void main(String[] args)
{
triangleAmax(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

Sort of single dimension array

public class arraydemosortsingle
{
public static void sort(int []x)
{
int i;
for( i=0;i=0;i--)
{

System.out.println(x[i]);
}

}

public static void main(String[] args)
{
sort(new int[] {44,22,77,55,22});
}

}

To find minimum number in single dimensional array

public class arraydemominsingle
{
public static int min(int []x)
{
int min=x[0];
for(int i=1;i {
if(x[i] {
min=x[i];
}
}
return min;
}
public static void main(String[] args)
{
System.out.println("Minimum value is"+min(new int[]{45,33,56,32}));

}
}

To find minimum number in double dimensional array

public class arraydemomindouble
{
public static int min(int [][]x)
{
int min=x[0][0];
for(int i=0;i<3;i++)
{
for(int j=0;j<2;j++)
{
if(x[i][j] {
min=x[i][j];
}
}
}
return min;
}
public static void main(String[] args)
{
System.out.println("Minimum value is"+min(new int[][]{{45,33},{56,32},{53,67}}));

}
}

Merge Sort

public class arraydemomergesort
{
public static void mergesort(int x[], int y[])
{
int i,j=0,z[];
z=new int [x.length+y.length];
for(i=0;i=0;i--)
{

System.out.println(z[i]);
}

}

public static void main(String[] args)
{
mergesort(new int[] {44,22,77,55,22},new int[]{22,59,64,77});
}

}

To find maximum number in single dimensional matrix

public class arraydemomaxsingle
{
public static int max(int []x)
{
int max=x[0];
for(int i=1;imax)
{
max=x[i];
}
}
return max;
}
public static void main(String[] args)
{
System.out.println("Maximum value is"+max(new int[]{45,33,56,32}));

}
}

To find Maximum number in Double dimensional matrix

public class arraydemomaxdouble
{
public static int max(int [][]x)
{
int max=x[0][0];
for(int i=0;i<3;i++)
{
for(int j=0;j<2;j++)
{
if(x[i][j] {
max=x[i][j];
}
}
}
return max;
}
public static void main(String[] args)
{
System.out.println("Maximum value is"+max(new int[][]{{45,33},{56,32},{53,67}}));

}
}

Summation of Matrices

public class arraydemomatrixsum {

static void matrixsum(int x[][])
{
int i,j,c,b=0,a=0;

for(i=0;i<3;i++)
{ c=0;
System.out.print(" ");
for(j=0;j<3;j++)
{
System.out.print(x[i][j]+" ");
c=c+x[i][j];
if(i==j)
{
b=b+x[i][j];
}
if(i+j==2)
{
a=a+x[i][j];
}
}
System.out.print(c);
System.out.println("");
}
System.out.print(a);
for(j=0;j<3;j++)
{ c=0;
for(i=0;i<3;i++)
{
c=c+x[i][j];
}
System.out.print(c+" ");

}
System.out.print(b);
}
public static void main(String[] args)
{
matrixsum(new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

Multiplication of matrices

public class arraydemomatrixmultiply {

static void matrixadd(int x[][],int y[][])
{
int i,j,k;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
System.out.print(x[i][j]+" ");

}
System.out.print(" ");
for(k=0;k<3;k++)
{
System.out.print(y[i][k]+" ");
}

System.out.println("");
}
int z[][];
z=new int[3][3];
for(i=0;i<3;i++)
{

for(j=0;j<3;j++)
{
z[i][j]=0;
for(k=0;k<3;k++)
{
z[i][j]= z[i][j]+x[i][k]*y[k][j];
}

System.out.print(z[i][j]+" ");
}
System.out.println("");
}
}
public static void main(String[] args)
{
matrixadd(new int[][]{{1,2,3},{4,5,6},{7,8,9}},new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

Addition of two matrics

public class arraydemomatrixadd {

static void matrixadd(int x[][],int y[][])
{
int i,j,k;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
System.out.print(x[i][j]+" ");

}
System.out.print(" ");
for(k=0;k<3;k++)
{
System.out.print(y[i][k]+" ");
}

System.out.println("");
}
int z[][];
z=new int[3][3];
for(i=0;i<3;i++)
{
for(j=0;j<3;j++)
{
z[i][j]= x[i][j]+y[i][j];
System.out.print(z[i][j]+" ");
}
System.out.println("");
}
}
public static void main(String[] args)
{
matrixadd(new int[][]{{1,2,3},{4,5,6},{7,8,9}},new int[][]{{1,2,3},{4,5,6},{7,8,9}});
}

}

Intersection of two sets

public class arraydemointersect
{

static void intersect(int x[],int y[])
{
int i,j,k=0,z[];
z=new int[5];
for(i=0;i {
for(j=0;j {
if (x[i]==y[j]&&x[i]!=z[j])
{
z[k]=x[i];
System.out.println(z[k]);
k++;
}
}
}
}

public static void main(String[] args)
{
intersect(new int[] {44,22,77,55,22,33},new int[]{22,59,64,77});
}

}