10 Must-Know Java Programs for ICSE Class 10

Why These Programs Matter

Practicing the right set of Java programs is crucial for scoring high in ICSE Class 10 Computer Applications. Here is a curated list of the top 10 programs most frequently asked in board exams, with explanations and tips.

Top 10 Must-Know Java Programs

1. Check Armstrong Number

   import java.util.*;
   class Armstrong {
     public static void main(String args[]) {
       Scanner sc = new Scanner(System.in);
       int n = sc.nextInt(), sum=0, temp=n;
       while(n>0){
         int d=n%10;
         sum+=d*d*d;
         n/=10;
       }
       if(sum==temp) System.out.println("Armstrong");
       else System.out.println("Not Armstrong");
     }
   }

2. Check Prime Number

   int n=29; boolean prime=true;
   for(int i=2;i<=n/2;i++){
     if(n%i==0){ prime=false; break; }
   }
   System.out.println(prime?"Prime":"Not Prime");

3. Reverse a Number

   int n=1234, rev=0;
   while(n>0){
     rev=rev*10+n%10;
     n/=10;
   }
   System.out.println("Reverse: "+rev);

4. Palindrome Check

   int n=121, temp=n, sum=0;
   while(n>0){ sum = sum*10 + n%10; n/=10; }
   System.out.println(sum==temp?"Palindrome":"Not Palindrome");

5. Sum of Digits

   int n=1234, sum=0;
   while(n>0){ sum+=n%10; n/=10; }
   System.out.println("Sum: "+sum);

6. Fibonacci Series

   int a=0,b=1,c;
   for(int i=1;i<=10;i++){
     System.out.print(a+" ");
     c=a+b; a=b; b=c;
   }

7. Factorial of a Number

   int n=5,f=1;
   for(int i=1;i<=n;i++) f*=i;
   System.out.println("Factorial: "+f);

8. Bubble Sort

   int a[]={5,3,8,1};
   for(int i=0;i<a.length-1;i++){
     for(int j=0;j<a.length-i-1;j++){
       if(a[j]>a[j+1]){
         int t=a[j]; a[j]=a[j+1]; a[j+1]=t;
       }
     }
   }

9. Linear Search

   int key=8,found=0;
   for(int i=0;i<a.length;i++){
     if(a[i]==key){ found=1; break; }
   }
   System.out.println(found==1?"Found":"Not Found");

10. String Palindrome

    String s="LEVEL";
    String r="";
    for(int i=s.length()-1;i>=0;i--) r+=s.charAt(i);
    System.out.println(s.equals(r)?"Palindrome":"Not Palindrome");

🔗 Related Links

• How to Score 90+ in ICSE Computer Applications
• Common Mistakes to Avoid in ICSE Computer Exam