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# Java prog upto week 8

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• 1. Week-1 EXERCISE-1: 1a ) Aim: The Fibonacci valuesinthe sequenceare 1 and 1. Everysubsequentvalue isthe sumof the twovaluesprecedingit.Write ajavaprogram that usesbothrecursive andnon-recursivefunctionsto printthe nth value inthe fibbonacci sequence. Program:*/ importjava.lang.*; importjava.util.*; classFibonacci { publicstaticvoidmain(Stringargs[]) { inta=0,b=1,c; System.out.println("Enternvalue"); Scannersc = newScanner(System.in); intn = sc.nextInt(); inti=3; System.out.println("Fibonacci series fornis"); System.out.print(a+""+b+""); while(i<=n) { c=a+b; a=b; b=c; System.out.print(c+""); i++;
• 2. } } } Output: Enter n value 5 Fibonacci seriesfornis 0 1 1 2 3
• 3. 1b) Recursion program: importjava.lang.*; importjava.util.*; classFibonacciRec { publicstaticvoidmain(Stringargs[]) { inta=0,b=1; Recurssionfr=newRecurssion(); Scannersc = newScanner(System.in); System.out.println("Enternvalue"); intn= sc.nextInt(); System.out.println("Fibonacci seriesfornis"); System.out.print(""+a+""+b+" "); fr.recurssion(n,a,b); } } classRecurssion { inti=3; publicvoidrecurssion(intn,inta,intb) {
• 4. intc; if(i<=n) { c=a+b; a=b; b=c; System.out.print(c+""); i++; recurssion(n,a,b); } } } Output: Enter n value 4 Fibonacci seriesfornis 0 1 1 2
• 5. Week-2 2) Aim: Write a javaprogram that prompts the user for an integer and the prints out all prime numbers upto that integer. Program:*/ importjava.io.*; importjava.lang.*; importjava.util.*; classPrime { publicstaticvoidmain(Stringargs[]) { int i,j,n,count=0; Scannersc=newScanner(System.in); System.out.println("Enternvalue:"); n=sc.nextInt(); for(i=1;i<=n;i++) { count=0; for(j=1;j<=i;j++) { if(i%j==0) count++; } if(count==2) System.out.println("t"+i); }
• 6. } } Output: Enter n value: 10 2 3 5 7
• 7. Week-3 3a) Aim: Write a java program that checks whether a given stringisa palindrome or not. Ex: MADAM is a palindrome.*/ Program: importjava.util.*; publicclassPalan { publicstaticvoidmain(Stringa[]) { System.out.println("Enteranystring"); Strings=newScanner(System.in).next(); for(inti=0,j=s.length()-1;i<=j;i++,j--) { if(s.charAt(i)==s.charAt(j)); else { System.out.println("NotPalindrome"); System.exit(1); } } System.out.println("Palindrome"); } } Output: Enter any string MADAM
• 8. Palindrome Enter anystring KAUSHIK Not Palindrome
• 9. 3b) Aim: Write a javaprogram for sortinga givenlistof namesinascendingorder. Program: importjava.util.*; classSortst { publicstaticvoidmain(Stringa[]) { System.out.println("How manystringuwantto enter"); Scannersc=newScanner(System.in); intn=sc.nextInt(); Stringst[]=newString[n+1]; for(inti=0;i<n;i++) { System.out.println("Enterstring"+(i+1)); st[i]=sc.next(); } for(inti=0;i<n-1;i++) { for(intj=i+1;j<n;j++) { if(st[i].compareTo(st[j])>0) { Stringt=st[i]; st[i]=st[j]; st[j]=t;
• 10. } } } System.out.println("Stringsinorderare :nn"); for(inti=0;i<n;i++) System.out.println(st[i]); } } Output: Enter string1 Kaushik Enter string2 College Enter string3 Engineering Enter string4 Courses Stringsinorder are: College Courses Engineering Kaushik
• 11. Week-4 4a) Aim: write javaprogram that readsa file name fromthe user,thendisplayinformationabout whetherthe file exists,whetherthe fileis readable,whetherthe fileiswritable,the type of fileandthe lengthof the file inbytes Program:*/ importjava.io.*; importjava.util.*; classFileattr { publicstaticvoidmain(Stringargs[]) { File f1=newFile(args[0]); System.out.println(f1.exists()?"fileexists":"doesnotexist"); System.out.println("Filename:"+f1.getName()); System.out.println("Filepath:"+f1.getAbsolutePath()); System.out.println(f1.isDirectory()?"isadirectory":"isasimple file"); System.out.println(f1.canRead()?"canbe read":"cannotbe read"); System.out.println(f1.canWrite()?"canbe write":"cannotbe write"); System.out.println("lengthof fileinbytes:"+f1.length()); } } Output: File exists Filename:First.txt Filepath:D:First.txt Is a simple file
• 12. Can be read Can be write Lengthof file inbytes:55
• 14. System.out.println("Usage:javaReadFilefilenamen"); } catch (IOExceptione) { e.printStackTrace(); } } } Output: D:>java Readfile first.txt 1:This ismy file 2:Kaushikengineeringcollege 3:Visakhapatnam
• 15. Week-5 5) Aim: Write a java programthat displaysthe numberof characters,linesandwordsina textfile. Program:*/ importjava.io.*; importjava.util.*; importjava.lang.*; publicclass ClwinText { private staticvoidlinecount(StringfName,BufferedReaderin) throwsIOException { longnumChar= 0; longnumLine=0; longnumWords= 0; Stringline; do{ line = in.readLine(); if (line !=null) { numChar+= line.length(); numWords+= wordcount(line); numLine++; } }while(line!=null); System.out.println("FileName:"+ fName); System.out.println("Numberof characters:" + numChar);
• 16. System.out.println("Numberof words:"+ numWords); System.out.println("Numberof Lines:"+ numLine); } private staticvoidlinecount(StringfileName) { BufferedReaderin= null; try { FileReaderfileReader=newFileReader(fileName); in= newBufferedReader(fileReader); linecount(fileName,in); } catch(IOExceptione) { e.printStackTrace(); } } private staticlongwordcount(Stringline) { longnumWords= 0; intindex = 0; booleanprevWhiteSpace =true; while(index<line.length()) { char c = line.charAt(index++);
• 17. booleancurrWhiteSpace =Character.isWhitespace(c); if(prevWhiteSpace &&!currWhiteSpace) { numWords++; } prevWhiteSpace=currWhiteSpace; } returnnumWords; } publicstaticvoidmain(String[] args) { longnumChar= 0; longnumLine=0; Stringline; try { if (args.length==0) { BufferedReaderin= new BufferedReader(newInputStreamReader(System.in)); line = in.readLine(); numChar= line.length(); if (numChar!= 0) { numLine=1; }
• 18. System.out.println("Numberof characters:" + numChar); System.out.println("Numberof words:"+ wordcount(line)); System.out.println("Numberof lines:"+ numLine); } else { for(inti = 0; i < args.length;i++) { linecount(args[i]); } } } catch(IOExceptione){ e.printStackTrace(); } } } Output: File Name:ClwinText.java Number of characters:1928 Numberof words:246 Numberof lines:91
• 19. Week -6 6a) Aim: write a javaprogram that: i)implementsstackADT. Program: importjava.io.*; importjava.util.*; classStack1 { inttop=-1,st[]=newint[5]; voidpush(intel) { st[++top]=el; } intpop() { return(st[top--]); } voiddisplay() { System.out.println("nStackelementsfromtoptobottomn"); for(inti=top;i>=0;i--) System.out.println(st[i]); } booleanisFull() {
• 20. return(top==5-1); } booleanisEmpty() { return(top==-1); } } classStack { publicstaticvoidmain(Stringa[]) { Scannersc=newScanner(System.in); Stack1 s=newStack1(); intel=0,ch=1; while(ch!=4) { System.out.println("n1.PUSHn2.POPn3.DISPLAYn4.EXIT"); System.out.println("ENTERYOURCHOICE"); ch=sc.nextInt(); switch(ch) { case 1:if(s.isFull()) System.out.println("nstackisfull"); else {
• 21. System.out.println("Enterelement"); el=sc.nextInt(); s.push(el); }break; case 2:if(s.isEmpty()) System.out.println("nstackisempty"); else { el=s.pop(); System.out.println("nDeletedelement="+el); }break; case 3:if(s.isEmpty()) System.out.println("nstackisempty"); else s.display(); break; case 4:break; default:System.out.println("nEntercorrectchoice"); } } } } Output: 1.PUSH 2.POP
• 22. 3.DISPLAY 4.EXIT Enter yourchoice 1 Enter element 52 Enter yourchoice 1 Enter element 45 Enter yourchoice 3 Stack elementsfromtopto bottom 45 52 Enter yourchoice 2 Deletedelement=45 Enter yourchoice 4
• 23. 6b) Aim: convertsinfix expressionintopostfixform. Program: importjava.io.*; importjava.util.*; publicclassInfixToPostfix { private StacktheStack; publicstaticvoidmain(String[] args) throwsIOException { BufferedReaderA = newBufferedReader(new InputStreamReader(System.in)); Stringmathex; System.out.println("enteramathematical expresion:"); mathex = A.readLine(); Stringinput= null; Stringoutput; InfixToPostfixtheTrans=newInfixToPostfix(mathex); output= theTrans.doTrans(); System.out.println("infix is:" + mathex + 'n'); System.out.println("postfix is:" + output + 'n'); }
• 24. Stringinput; Stringoutput= ""; publicInfixToPostfix(Stringin) { input= in; intstackSize = input.length(); theStack= newStack(stackSize); } publicStringdoTrans() { for(intj = 0; j < input.length();j++) { char ch = input.charAt(j); switch(ch) { case '+': case '-': gotOper(ch,1); break; case '*': case '/': gotOper(ch,2); break; case '(': theStack.push(ch);
• 25. break; case ')': gotParen(ch); break; default: output= output+ ch; break; } } while (!theStack.isEmpty()) { output= output+ theStack.pop(); } return output; } publicvoidgotOper(charopThis,intprec1) { while (!theStack.isEmpty()) { char opTop= theStack.pop(); if (opTop== '(') { theStack.push(opTop); break; } else { int prec2; if (opTop== '+' || opTop == '-')
• 26. prec2 = 1; else prec2 = 2; if (prec2< prec1) { theStack.push(opTop); break; } else output= output+ opTop; } } theStack.push(opThis); } publicvoidgotParen(charch){ while (!theStack.isEmpty()) { char chx = theStack.pop(); if (chx == '(') break; else output= output+ chx; } }
• 27. classStack { private intmaxSize; private char[] stackArray; private inttop; publicStack(intmax) { maxSize =max; stackArray= newchar[maxSize]; top = -1; } publicvoidpush(charj) { stackArray[++top] = j; } publicchar pop() { returnstackArray[top--]; } publicchar peek() { returnstackArray[top]; } publicbooleanisEmpty() { return(top == -1); } } }
• 28. Output: Enter a mathematical expression A+b*c Infix is:a+b*c Postfix is:abc*+ Enter a mathematical expression (a+b)*(c/d)*e-f Infix is:(a+b)*(c/d)*e-f Postfix is:ab+cd/e*f-
• 29. Week -7 7) Aim: Write a Java programthat createsthree threads.Firstthreaddisplays“GoodMorning” everyone second,the second threaddisplays“Hello”everytwosecondsandthe third threaddisplays“Welcome”everythree seconds. Program:*/ classA extendsThread { synchronizedpublicvoidrun() { try { while(true) { sleep(1000); System.out.println("goodmorning"); } } catch(Exceptione) { } } } classB extendsThread { synchronizedpublicvoidrun()
• 30. { try { while(true) { sleep(2000); System.out.println("hello"); } } catch(Exceptione) { } } } classC extendsThread { synchronizedpublicvoidrun() { try { while(true) { sleep(3000); System.out.println("welcome"); } }
• 31. catch(Exceptione) { } } } classThreadDemo { publicstaticvoidmain(Stringargs[]) { A t1=newA(); B t2=new B(); C t3=new C(); t1.start(); t2.start(); t3.start(); } } Output: goodmorning goodmorning hello goodmorning welcome hello goodmorning goodmorning
• 32. Week -8 8) Aim: Sample Programtoimplementpackage package Demo; publicclassA { publicvoiddisplay() { System.out.println("HelloVinay"); } } importDemo.*; publicclasspackageDemo { publicstaticvoidmain(Stringargs[]) { A ob=newA(); ob.display(); } } Output: D:>cd demo D:Demo>javacA.java D:Demo>cd..
• 33. D:>javac packageDemo.java D:>javapackageDemo Hello world