🗊Презентация 3. Essential Java Classes. 1. Strings

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3. Essential Java Classes 1. Strings
Описание слайда:
3. Essential Java Classes 1. Strings

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Strings Strings are a sequence of characters. In the Java strings are objects. The simplest way to create a string String greeting = "Hello world!";
Описание слайда:
Strings Strings are a sequence of characters. In the Java strings are objects. The simplest way to create a string String greeting = "Hello world!";

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String Length String palindrome = "А роза упала на лапу Азора"; int len = palindrome.length();
Описание слайда:
String Length String palindrome = "А роза упала на лапу Азора"; int len = palindrome.length();

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Concatenation and addition int a = 5; int b = 3; String S = "-output-"; System.out.println (S + a + b); System.out.println (a + b + S); What will be the output?
Описание слайда:
Concatenation and addition int a = 5; int b = 3; String S = "-output-"; System.out.println (S + a + b); System.out.println (a + b + S); What will be the output?

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Converting Numbers to Strings The simplest way: String s = "" + 6; Another way: String tp = String.valueOf(18.3); Formatting: String mes = String.format("Result = %d", 25);
Описание слайда:
Converting Numbers to Strings The simplest way: String s = "" + 6; Another way: String tp = String.valueOf(18.3); Formatting: String mes = String.format("Result = %d", 25);

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Strings Comparing (1 of 3) String s1 = "hello"; String s2 = "hello"; if (s1 == s2) System.out.println(“Equal”); else System.out.println(“Not equal”); What will be the output?
Описание слайда:
Strings Comparing (1 of 3) String s1 = "hello"; String s2 = "hello"; if (s1 == s2) System.out.println(“Equal”); else System.out.println(“Not equal”); What will be the output?

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Strings Comparing (2 of 3) String s1 = "hello"; String s2 = new String("hello“); if (s1 == s2) System.out.println(“Equal”); else System.out.println(“Not equal”); What will be the output?
Описание слайда:
Strings Comparing (2 of 3) String s1 = "hello"; String s2 = new String("hello“); if (s1 == s2) System.out.println(“Equal”); else System.out.println(“Not equal”); What will be the output?

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Strings Comparing (3 of 3) You should use equals method instead of == String s1 = "hello"; String s2 = new String("hello“); if (s1.equals(s2)) System.out.println(“Equal”); else System.out.println(“Not equal”);
Описание слайда:
Strings Comparing (3 of 3) You should use equals method instead of == String s1 = "hello"; String s2 = new String("hello“); if (s1.equals(s2)) System.out.println(“Equal”); else System.out.println(“Not equal”);

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Some String Methods indexOf(String subString) substring(int posBeg, int posEnd) toUpperCase(), toLowerCase() trim() replace(CharSequence targ, CharSequence replace) split(String regex) valueOf(value) – static
Описание слайда:
Some String Methods indexOf(String subString) substring(int posBeg, int posEnd) toUpperCase(), toLowerCase() trim() replace(CharSequence targ, CharSequence replace) split(String regex) valueOf(value) – static

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indexOf method String palindrome = "Niagara. O roar again!"; System.out.println(palindrome.indexOf("roar")); What will be the output?
Описание слайда:
indexOf method String palindrome = "Niagara. O roar again!"; System.out.println(palindrome.indexOf("roar")); What will be the output?

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substring Method String palindrome = "Niagara. O roar again!"; System.out.println(palindrome.substring(11, 15)); System.out.println(palindrome.substring(11)); What will be the output?
Описание слайда:
substring Method String palindrome = "Niagara. O roar again!"; System.out.println(palindrome.substring(11, 15)); System.out.println(palindrome.substring(11)); What will be the output?

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replace Method String s = "Niagara. O roar again!"; s = s.replace("a", "A"); System.out.println(s); What will be the output?
Описание слайда:
replace Method String s = "Niagara. O roar again!"; s = s.replace("a", "A"); System.out.println(s); What will be the output?

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split Method String palindrome = "Niagara. O roar again!"; String[] txt = palindrome.split("r"); for (String t : txt){ System.out.println(t); } What will be the output?
Описание слайда:
split Method String palindrome = "Niagara. O roar again!"; String[] txt = palindrome.split("r"); for (String t : txt){ System.out.println(t); } What will be the output?

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String Methods See http://docs.oracle.com/javase/7/docs/api/java/lang/String.html for details
Описание слайда:
String Methods See http://docs.oracle.com/javase/7/docs/api/java/lang/String.html for details

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Exercise 3.1.1. Write a program that computes your initials from your full name and displays them
Описание слайда:
Exercise 3.1.1. Write a program that computes your initials from your full name and displays them

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Exercise 3.1.1. See 311Initials project for the full text.
Описание слайда:
Exercise 3.1.1. See 311Initials project for the full text.

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Strings and Arrays It is impossible to work with strings as with arrays: String s="hello"; System.out.println(s[2]); // compile error From string to char array: char[] sArray = s.toCharArray(); From char array to string: String helloString = new String(sArray);
Описание слайда:
Strings and Arrays It is impossible to work with strings as with arrays: String s="hello"; System.out.println(s[2]); // compile error From string to char array: char[] sArray = s.toCharArray(); From char array to string: String helloString = new String(sArray);

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String Formatting String s1 = ""; s1 = String.format("a =%1$3d, b =%2$7.2f, b = %2$6.4e", 12, 122.589); Output: a = 12, b = 122,59, b = 1.2259e+02 s1 = String.format("a =%1$3d, a =%1$4o, a = %1$2x", 43); Output: a = 43, a = 53, a = 2b See http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html for details
Описание слайда:
String Formatting String s1 = ""; s1 = String.format("a =%1$3d, b =%2$7.2f, b = %2$6.4e", 12, 122.589); Output: a = 12, b = 122,59, b = 1.2259e+02 s1 = String.format("a =%1$3d, a =%1$4o, a = %1$2x", 43); Output: a = 43, a = 53, a = 2b See http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html for details

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Format String The format string consists of static text embedded with format specifiers Except for the format specifiers, the format string is output unchanged Format specifiers begin with a % and end with a 1- or 2-character conversion that specifies the kind of formatted output being generated
Описание слайда:
Format String The format string consists of static text embedded with format specifiers Except for the format specifiers, the format string is output unchanged Format specifiers begin with a % and end with a 1- or 2-character conversion that specifies the kind of formatted output being generated

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Format Specifiers d formats an integer value as a decimal value. f formats a floating point value as a decimal value. n outputs a platform-specific line terminator s formats any value as a string x formats an integer as a hexadecimal value tD formats date
Описание слайда:
Format Specifiers d formats an integer value as a decimal value. f formats a floating point value as a decimal value. n outputs a platform-specific line terminator s formats any value as a string x formats an integer as a hexadecimal value tD formats date

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Examples of Format Specifiers System.out.format("%1f, %1$+012.10f %n", Math.PI); Output is 3.141593, +03.1415926536 System.out.format("%1$5s %2$7.5f", "e = ", Math.E); Output is e = 2.71828 See for detailes http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax
Описание слайда:
Examples of Format Specifiers System.out.format("%1f, %1$+012.10f %n", Math.PI); Output is 3.141593, +03.1415926536 System.out.format("%1$5s %2$7.5f", "e = ", Math.E); Output is e = 2.71828 See for detailes http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax

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Application main Method Every application must contain a main method whose signature is: public static void main(String[] args) The main method accepts a single argument: an array of elements of type String This array is the mechanism through which the runtime system passes information to your application: java MyApp arg1 arg2
Описание слайда:
Application main Method Every application must contain a main method whose signature is: public static void main(String[] args) The main method accepts a single argument: an array of elements of type String This array is the mechanism through which the runtime system passes information to your application: java MyApp arg1 arg2

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How to Run Application with Arguments in Eclipse Right click on project name in the Package Explorer and select Run As > Run Configuration Go to Arguments tab and write argument values in the Program arguments field Press Apply button, then Run button
Описание слайда:
How to Run Application with Arguments in Eclipse Right click on project name in the Package Explorer and select Run As > Run Configuration Go to Arguments tab and write argument values in the Program arguments field Press Apply button, then Run button

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Exercise 3.1.2. Create a program that will print every other argument given on the command line. If the program was executed with the following on the command line, java ArgumentSkipper one two three a b c d the program would print one three b d Consider how your program would operate when no arguments are given
Описание слайда:
Exercise 3.1.2. Create a program that will print every other argument given on the command line. If the program was executed with the following on the command line, java ArgumentSkipper one two three a b c d the program would print one three b d Consider how your program would operate when no arguments are given

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Run Application java app/E312Arguments one two three a b c d
Описание слайда:
Run Application java app/E312Arguments one two three a b c d

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JAR Files The Java Archive (JAR) file format enables you to bundle multiple files into a single archive file Run JAR-packaged applications with the Java interpreter: java -jar jar-file
Описание слайда:
JAR Files The Java Archive (JAR) file format enables you to bundle multiple files into a single archive file Run JAR-packaged applications with the Java interpreter: java -jar jar-file

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Create JAR File in Eclipse Open workspace with necessary project Menu item File / Export Choose Java / Runnable JAR file in “Select an export destination”, then Next Select your project in “Launch configuration” dropdown list Fill “Export destination” field with JAR file name (Browse button can be used) Click Finish button
Описание слайда:
Create JAR File in Eclipse Open workspace with necessary project Menu item File / Export Choose Java / Runnable JAR file in “Select an export destination”, then Next Select your project in “Launch configuration” dropdown list Fill “Export destination” field with JAR file name (Browse button can be used) Click Finish button

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Run Application java -jar ArgumentSkipper.jar one two three a b c d
Описание слайда:
Run Application java -jar ArgumentSkipper.jar one two three a b c d

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String vs StringBuilder Objects of the String class are immutable. A new String object is created during string modification. StringBuilder objects can be modified. StringBuilder objects are more effective when a lot of string modifications are needed
Описание слайда:
String vs StringBuilder Objects of the String class are immutable. A new String object is created during string modification. StringBuilder objects can be modified. StringBuilder objects are more effective when a lot of string modifications are needed

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StringBuilder Methods (1 of 2) indexOf(String subString) substring(int posBeg, int posEnd) length() The following are absent: trim() split(String regex) valueOf(value) – static
Описание слайда:
StringBuilder Methods (1 of 2) indexOf(String subString) substring(int posBeg, int posEnd) length() The following are absent: trim() split(String regex) valueOf(value) – static

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StringBuilder Methods (2 of 2) append(type arg) - appends the argument to the string insert(int offset, type arg) - inserts the second argument into the string from offset replace(int start, int end, String s) - replaces the specified characters in this string reverse() - reverses the sequence of characters in this string See http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html for details
Описание слайда:
StringBuilder Methods (2 of 2) append(type arg) - appends the argument to the string insert(int offset, type arg) - inserts the second argument into the string from offset replace(int start, int end, String s) - replaces the specified characters in this string reverse() - reverses the sequence of characters in this string See http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html for details

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append Method StringBuilder s1 = new StringBuilder("Hello"); s1.append(" world!"); System.out.println(s1); What will be the output?
Описание слайда:
append Method StringBuilder s1 = new StringBuilder("Hello"); s1.append(" world!"); System.out.println(s1); What will be the output?

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insert Method StringBuilder s1 = new StringBuilder("Niagara again!"); s1.insert(7, ". O roar"); System.out.println(s1); What will be the output?
Описание слайда:
insert Method StringBuilder s1 = new StringBuilder("Niagara again!"); s1.insert(7, ". O roar"); System.out.println(s1); What will be the output?

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replace Method StringBuilder s1 = new StringBuilder("Niagara. O roar again!"); s1.replace(7, 16, " "); System.out.println(s1); What will be the output?
Описание слайда:
replace Method StringBuilder s1 = new StringBuilder("Niagara. O roar again!"); s1.replace(7, 16, " "); System.out.println(s1); What will be the output?

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reverse Method StringBuilder s1 = new StringBuilder("Niagara. O roar again!"); s1.reverse(); System.out.println(s1); What will be the output?
Описание слайда:
reverse Method StringBuilder s1 = new StringBuilder("Niagara. O roar again!"); s1.reverse(); System.out.println(s1); What will be the output?

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Exercise 3.1.3. A palindrome is a text phrase that spells the same thing backward and forward. The word redivider is a palindrome, since the word would spell the same even if the character sequence were reversed. Write a program that takes a word as an argument and reports whether the word is a palindrome
Описание слайда:
Exercise 3.1.3. A palindrome is a text phrase that spells the same thing backward and forward. The word redivider is a palindrome, since the word would spell the same even if the character sequence were reversed. Write a program that takes a word as an argument and reports whether the word is a palindrome

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Home Exercise 3.1.4. Create a generateString method that gets an integer argument n and returns a string contains first n integer numbers with gaps between them Create a generateStringBuilder method that does the same with StringBuilder class Compare these methods performance (with help of System.nanoTime();)
Описание слайда:
Home Exercise 3.1.4. Create a generateString method that gets an integer argument n and returns a string contains first n integer numbers with gaps between them Create a generateStringBuilder method that does the same with StringBuilder class Compare these methods performance (with help of System.nanoTime();)

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Manuals http://docs.oracle.com/javase/tutorial/java/data/strings.html
Описание слайда:
Manuals http://docs.oracle.com/javase/tutorial/java/data/strings.html

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