string api guide

Author: rfadatare

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.javaguides.stringhandling</groupId>
+  <artifactId>java-strings-guide</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+</project>

src/main/java/com/javaguides/stringbuffer/methods/AppendExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class AppendExample {
+	public static void main(String[] args) {
+		// 14 append overloaded methods
+
+		// Append String
+		StringBuffer buffer;
+		buffer = new StringBuffer().append("guides");
+		System.out.println("Append String : " + buffer);
+
+		// Append char
+		buffer = new StringBuffer().append('c');
+		System.out.println("Append char : " + buffer);
+
+		// Append Object
+		buffer = new StringBuffer().append(new Object().getClass());
+		System.out.println("Append Object : " + buffer);
+
+		// Append chars
+		char[] chars = { 'j', 'a', 'v', 'a' };
+		buffer = new StringBuffer().append(chars);
+		System.out.println("Append chars : " + buffer);
+
+		// Append charSequence
+		CharSequence charSequence = new String("charSequence");
+		buffer = new StringBuffer().append(charSequence);
+		System.out.println("Append charSequence : " + buffer);
+
+		// Append Double
+		buffer = new StringBuffer().append(10.0d);
+		System.out.println("Append Double : " + buffer);
+
+		// Append Float
+		buffer = new StringBuffer().append(10.5f);
+		System.out.println("Append Float : " + buffer);
+
+		// Append int
+		buffer = new StringBuffer().append(100);
+		System.out.println("Append int : " + buffer);
+
+		// Append Boolean
+		buffer = new StringBuffer().append(true);
+		System.out.println("Append Boolean : " + buffer);
+
+		// Append Long
+		buffer = new StringBuffer().append(1000);
+		System.out.println("Append Long : " + buffer);
+
+		// Append stringbuffer
+		buffer = new StringBuffer().append(new StringBuffer("stringbuffer"));
+		System.out.println("Append stringbuffer : " + buffer);
+
+		// Appends the string representation of a subarray of the char array
+		// argument to this sequence.
+		buffer = new StringBuffer().append(chars, 1, 3);
+		System.out.println("Appends the string representation of a "
+				+ " subarray of the char array argument to this sequence.  : " + buffer);
+
+		// Appends a subsequence of the specified CharSequence to this sequence
+		buffer = new StringBuffer().append("javaguides", 0, 9);
+		System.out.println("Appends a subsequence of the specified " 
+		+ " CharSequence to this sequence. : " + buffer);
+
+		// Appends the string representation of the codePoint argument to this
+		// sequence.
+		buffer = new StringBuffer().appendCodePoint(5);
+		System.out.println(
+				"Appends the string representation of the "
+		+ " codePoint argument to this sequence.  : " + buffer);
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/CapacityExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class CapacityExample {
+	public static void main(String[] args) {
+		StringBuffer builder = new StringBuffer("javaguides");
+		int capacity = builder.capacity();
+		
+		// inital capacity
+		System.out.println(new StringBuffer().capacity());
+		
+		// intial capacity 16 + number of characters in string
+		System.out.println("Capacity of the string :: " + capacity);
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/ChatAtExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class ChatAtExample {
+	public static void main(String[] args) {
+		charAtExample1();
+		//charAtExample2();
+		charAtExample3();
+	}
+
+	public static void charAtExample1() {
+		StringBuffer buffer = new StringBuffer("Welcome to string handling guide");
+		char ch1 = buffer.charAt(0);
+		char ch2 = buffer.charAt(5);
+		char ch3 = buffer.charAt(11);
+		char ch4 = buffer.charAt(20);
+		System.out.println("Character at 0 index is: " + ch1);
+		System.out.println("Character at 5th index is: " + ch2);
+		System.out.println("Character at 11th index is: " + ch3);
+		System.out.println("Character at 20th index is: " + ch4);
+	}
+
+	// IndexOutOfBoundsException - if the index argument is negative or not less
+	// than the length of this string.
+	public static void charAtExample2() {
+		StringBuffer builder = new StringBuffer("Java Guides");
+		char ch1 = builder.charAt(builder.length());
+		System.out.println("character :: " + ch1);
+	}
+
+	// How to get first and last chanracter of the string
+	public static void charAtExample3() {
+		StringBuffer buffer = new StringBuffer("Java Guides");
+		int strLength = buffer.length() - 1;
+		// Fetching first character
+		System.out.println("Character at 0 index is: " + buffer.charAt(0));
+		// The last Character is present at the string length-1 index
+		System.out.println("Character at last index is: " + buffer.charAt(strLength));
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/CodePointAtExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class CodePointAtExample {
+	public static void main(String[] args) {
+		StringBuffer buffer = new StringBuffer("javaguides");
+		int unicode = buffer.codePointAt(0);
+		System.out.println("the character (Unicode code point) at the specified index is :: " + unicode);
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/CodePointBeforeExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class CodePointBeforeExample {
+	public static void main(String[] args) {
+		StringBuffer buffer = new StringBuffer("javaguides");
+		int unicode = buffer.codePointBefore(1);
+		System.out.println("the character (Unicode code point) at the before specified index is :: " + unicode);
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/CodePointCountExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class CodePointCountExample {
+	public static void main(String[] args) {
+		StringBuffer buffer = new StringBuffer("javaguides");
+		System.out.println("length of the string :: " + buffer.length());
+		int unicode = buffer.codePointCount(0, buffer.length());
+		System.out.println("the character (Unicode code point) at the specified index is :: " + unicode);
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/DeleteExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class DeleteExample {
+	public static void main(String[] args) {
+		StringBuffer buffer = new StringBuffer("javaguides");
+		
+		// start with index and end with end -1
+		StringBuffer subBuffer = buffer.delete(0, 4);
+		System.out.println("Delete string 'java' from string 'javaguides' : " + subBuffer.toString());
+
+		StringBuffer subBuilder1 = new StringBuffer("javaguides").deleteCharAt(4);
+		System.out.println("Delete char 'g' from string 'javaguides' : " + subBuilder1);
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/EnsureCapacityExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class EnsureCapacityExample {
+	public static void main(String[] args) {
+		StringBuffer builder = new StringBuffer();
+		builder.ensureCapacity(11);
+	    System.out.println(builder.capacity());
+	    builder.ensureCapacity(17);
+	    System.out.println(builder.capacity());
+	}
+}

src/main/java/com/javaguides/stringbuffer/methods/GetCharsExample.java

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+package com.javaguides.stringbuffer.methods;
+
+public class GetCharsExample {
+	public static void main(String[] args) {
+		StringBuffer buffer = new StringBuffer("javaguides");
+		char[] dst = new char[buffer.length()];
+		buffer.getChars(0, buffer.length(), dst, 0);
+		
+		for (char c : dst) {
+			System.out.println(c);
+		}
+	}
+}