TUGAS PERSONAL
PROGRAM STUDI SISTEM INFORMASI
BINUS UNIVERSITY

[pic]

ALGORITHM AND PROGRAMMING

15 Juni 2015

RAHMAYEZI EDWAR
1801490330

Bina Nusantara University
Jakarta

Tugas Personal ke-1
Minggu 2

Review Questions: 1. Java source filename extension is “.java”, and the Java bytecode filename extension is ".class" 2. Java is case sensitive? Java distinguish between uppercase and lowercase. The case for Java keywords, such as "String", “string”, "Int", “int”, etc, are different. 3. There is no effect on runtime performance between: a. Import java.util.Scanner; b. Import java.util.*; The facts are: • There is no runtime cost from using an import statement • The compilation process can take a little more time with an import statement • The compilation process can take even more time with a wildcard import statement • For improved readability, wildcard import statements are bad practice for anything but throwaway classes • The compilation overhead of non-wildcard import statements are minor, but they give readability benefits so best practice is to use them 4. Pseudo-code and flowchart to create: a. an algorithm to calculate a triangle area [pic]

b. an algorithm to change second into hour and minute unit [pic]

5. Describe and give example for each method of String a. contains The java string contains() method searches the sequence of characters in this string. It returns true if sequence of char values are found in this string otherwise returns false. e.g. [pic] b. concat The java string concat() method combines specified string at the end of this string. It returns combined string. It is like appending another string. e.g: [pic] c. compareTo The java string compareTo() method compares the given string with current string lexicographically. It returns positive number, negative number or 0. e.g: [pic] d. format The java string format() method returns the formatted string by given locale, format and arguments. e.g. [pic] e. charAt The java string charAt() method returns a char value at the given index number. The index number starts from 0 e.g. [pic] f. replace The java string replace() method returns a string replacing all the old char or CharSequence to new char or CharSequence. e.g [pic] g. substring The java string substring() method returns a part of the string. e.g: [pic] h. trim The java string trim() method eliminates leading and trailing spaces. The unicode value of space character is '\u0020'. The trim() method in java string checks this unicode value before and after the string, if it exists then removes the spaces and returns the omitted string. e.g: [pic] i. toCharArray The java string toCharArray() method converts this string into character array. It returns a newly created character array, its length is similar to this string and its contents are initialized with the characters of this string. e.g: [pic] j. split The java string split() method splits this string against given regular expression and returns a char array. e.g: [pic] k. toLowerCase The java string toLowerCase() method returns the string in lowercase letter. In other words, it converts all characters of the string into lower case letter. e.g [pic] l. toUpperCase The java string toUpperCase() method returns the string in uppercase letter. In other words, it converts all characters of the string into upper case letter. e.g: [pic]

Programming Exercise: Program untuk mempelajari tipe data dalam pemrograman Java, dengan menggunakan beberapa ketentuan seperti ini: 1. Pada awal program, user akan diminta untuk: ▪ Memasukkan tipe data Boolean, user diminta untuk memasukkan “true” atau “false” ▪ Memasukkan tipe data int, user diminta untuk memasukkan bilangan bulat ▪ Memasukkan tipe data Double, user diminta untuk memasukkan bilangan decimal ▪ Memasukkan tipe data String, user diminta untuk memasukkan kata atau kalimat 2. Kemudian semua hasil yang dimasukkan user, akan ditampilkan pada akhir program.
Programnya adalah sebagai berikut:
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References: http://www.javaperformancetuning.com/news/qotm031.shtml http://www.javatpoint.com/methods-of-string-class

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Set float a, b, c, s, area;
Scan a, b, c; s = (a+b+c)/2; area = sqrt (s*(s-a)*(s-b)*(s-c)); print area;

Begin

Read a, b, c

s = (a+b+c)/2; area = sqrt (s*(s-a)*(s-b)*(s-c));

print area

End

Set int s, ss, m, h;
Scan ss; s = Mod (ss, 60); m = Mod ((T/60), 60) h = (T/(60*60)); print h + m + s;

Begin

Read ss

s = Mod (ss, 60); m = Mod ((T/60), 60) h = (T/(60*60));

print area

End

1. class ContainsEzi{ 2. public static void main(String args[]){ 3. String name="Rahmayezi Edwar"; 4. System.out.println(name.contains("do you know me")); 5. System.out.println(name.contains("about me")); 6. System.out.println(name.contains("hello")); 7. }}

1. public class ConcatEzi{ 2. public static void main(String args[]){ 3. String s1="java string"; 4. s1.concat("is immutable"); 5. System.out.println(s1); 6. s1=s1.concat(" is immutable so assign it explicitly"); 7. System.out.println(s1); 8. }}

1. public class LastIndexOfEzi{ 2. public static void main(String args[]){ 3. String s1="hello"; 4. String s2="hello"; 5. String s3="meklo"; 6. String s4="hemlo"; 7. System.out.println(s1.compareTo(s2)); 8. System.out.println(s1.compareTo(s3)); 9. System.out.println(s1.compareTo(s4)); 10. }}

1. public class FormatEzi{ 2. public static void main(String args[]){ 3. String name="sonoo"; 4. String sf1=String.format("name is %s",name); 5. String sf2=String.format("value is %f",32.33434); 6. String sf3=String.format("value is %32.12f",32.33434);//returns 12 char fractional part filling with 0 7. 8. System.out.println(sf1); 9. System.out.println(sf2); System.out.println(sf3); }}

1. public class CharAtEzi{ 2. public static void main(String args[]){ 3. String name="javatpoint"; 4. char ch=name.charAt(4);//returns the char value at the 4th index 5. System.out.println(ch); 6. }}

1. public class ReplaceEzi{ 2. public static void main(String args[]){ 3. String s1="javatpoint is a very good website"; 4. String replaceString=s1.replace('a','e');//replaces all occurrences of 'a' to 'e' 5. System.out.println(replaceString); 6. }}

1. public class SubstringEzi{ 2. public static void main(String args[]){ 3. String s1="javatpoint"; 4. System.out.println(s1.substring(2,4));//returns va 5. System.out.println(s1.substring(2));//returns vatpoint 6. }}

1. public class StringTrimEzi{ 2. public static void main(String args[]){ 3. String s1=" hello string "; 4. System.out.println(s1+"javatpoint");//without trim() 5. System.out.println(s1.trim()+"javatpoint");//with trim() 6. }}

1. public class StringToCharArrayEzi{ 2. public static void main(String args[]){ 3. String s1="hello"; 4. char[] ch=s1.toCharArray(); 5. for(int i=0;i