Java-Programs/String/StringExamples.java at master · githubanalyzeruser/Java-Programs · GitHub

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package String;

public class StringExamples {

public static void main(String[] args) {

// Strings are immutable

String str3 = "value1";

str3.concat("value2");

System.out.println(str3); // value1

// The result should be assigned to a new reference variable (or same

// variable) can be reused.

String concat = str3.concat("value2");

System.out.println(concat); // value1value2

// A String value once created, cannot be changed.

// If a method is invoked on string object, it returns a new object and

// will not modify the original object.

// All strings literals are stored in "String constant pool".

// If compiler finds a String literal,it checks if it exists in the

// pool.

// If it exists, it is reused.

// 1 string object (created on the pool) and 1 reference variable

//String str1 = "value";

// However, if new operator is used to create string object,

// the new object is created on the heap

// Following piece of code create 2 objects

// 1. String Literal "value" - created in the "String constant pool"

// 2. String Object - created on the heap

//String str2 = new String("value");

// String methods

String str = "abcdefghijk";

// 01234567890

// char charAt(int paramInt)

System.out.println(str.charAt(2)); // prints a char - c

// String concat(String paramString)

System.out.println(str.concat("lmn"));// abcdefghijklmn

System.out.println("ABC".equalsIgnoreCase("abc"));// true

System.out.println("ABCDEFGH".length());// 8

// String replace(char paramChar1, char paramChar2)

System.out.println("012301230123".replace('0', '4'));// 412341234123

// String replace(CharSequence paramCharSequence1, CharSequence

// paramCharSequence2)

System.out.println("012301230123".replace("01", "45"));// 452345234523

// All characters from index paramInt

// String substring(int paramInt)

System.out.println("abcdefghij".substring(3)); // cdefghij

// 0123456789

// All characters from index 3 to 6

System.out.println("abcdefghij".substring(3, 7)); // defg

// 0123456789

System.out.println("ABCDEFGHIJ".toLowerCase()); // abcdefghij

System.out.println("abcdefghij".toUpperCase()); // ABCDEFGHIJ

System.out.println("abcdefghij".toString()); // abcdefghij

// trim removes leading and trailings spaces

System.out.println(" abcd ".trim()); // abcd

}

Java-Programs/String/StringExamples.java at master · githubanalyzeruser/Java-Programs · GitHub

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