1)

import java.util.*;
class  ArrayExamples
{
  public static int getMaxValue(int[] arr){
  int maxValue = arr[0];
  for(int i=1;i < arr.length;i++){
    if(arr[i] > maxValue){
      maxValue = arr[i];
    }
  }
  return maxValue;
}

public static int getMinValue(int[] arr){
  int minValue = arr[0];
  for(int i=1;i<arr.length;i++){
    if(arr[i] < minValue){
      minValue = arr[i];
    }
  }
  return minValue;
}
    public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        System.out.println("Enter Array Elements: ");
        int array[]=new int[5];
        for(int i=0;i<array.length;i++){
            int num=input.nextInt();
            array[i]=num;
        }
        System.out.println("Smallest No: "+getMinValue(array));
        System.out.println("Largest No: "+getMaxValue(array));
    }
}

2)

import java.util.*;
class  ArrayExamples
{
  public static void main(String[] args){
        Scanner input=new Scanner(System.in);
        System.out.println("Enter Number: ");
        int number=input.nextInt();
        String binary=Integer.toBinaryString(number);
        System.out.println("Binary: "+binary);
        long num = Long.parseLong(binary);
        long rem;
        while(num > 0){
        rem = num % 10;
        num = num / 10;
        if(rem != 0 && rem != 1){
        System.exit(0);
      }
    }
    int i= Integer.parseInt(binary,2);
    System.out.println("Decimal: "+ i);
    }
}

3)

import java.util.*;
class MatrixExamples{

    public static void main(String[] args){
    Scanner input = new Scanner(System.in);
    int[][] A = new int[3][3];
int[][] B = new int[3][3];
int[][] C = new int[3][3];
System.out.println("Enter elements for matrix A : ");
for (int i=0 ; i < A.length ; i++)
for  (int j=0 ; j < A[i].length ; j++){
A[i][j] = input.nextInt();
}
System.out.println("Enter elements for matrix B : ");
for (int i=0 ; i < B.length ; i++)
for  (int j=0 ; j < B[i].length ; j++){
B[i][j] = input.nextInt();
}
System.out.println("Matrix A: ");
        for (int i=0 ; i < A.length ; i++)
        {     System.out.println();
            for  (int j=0 ; j < A[i].length ; j++){
                System.out.print(A[i][j]+" ");
                  }
        }
System.out.println();
System.out.println("Matrix B: ");
        for (int i=0 ; i < B.length ; i++)
        {     System.out.println();
            for  (int j=0 ; j < B[i].length ; j++){
                System.out.print(B[i][j]+" ");
                  }
        }
System.out.println();
int menu = 0;
System.out.println();
System.out.println("1. Addition Of Matrix");
System.out.println("2. Subtraction Of Matrix");
System.out.println("3. Multiplication Of Matrix");
System.out.println("4. Division Of Matrix");
System.out.println("5. Exit");
boolean quit = false;
do{
System.out.print("Please enter your choice: ");
menu = input.nextInt();
System.out.println();

switch(menu) {
case 1:
    System.out.println("Sum of 2 matrices");
    for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
C[i][j]=A[i][j]+B[i][j];
System.out.print(C[i][j]+" ");
}
System.out.println();
}
break;
case 2:
    System.out.println("Subtraction of 2 matrices");
    for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
C[i][j]=A[i][j]-B[i][j];
System.out.print(C[i][j]+" ");
}
System.out.println();
}
break;
case 3:
System.out.println("Multiplication of 2 matrices");

for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
for(int k=0;k<3;k++){
C[i][j]+=A[i][k]*B[k][j];
}
}
}
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
System.out.print(+C[i][j]+" ");
}
System.out.println();
} 
break;
case 4:
    System.out.println("Division of 2 matrices : ");
        for(int i = 0; i < 3; i++) {
      for(int j = 0; j < 3; j++) {
      C[i][j]=A[i][j]/B[i][j];
      System.out.print(C[i][j]+" ");
      }
      System.out.println(" ");
      }
case 5:
quit = true;
break;
default:
System.out.println("Invalid Entry!");
 }
}
while (!quit);
}
}

Transpose of Matrix