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The capacity() method is a method of the StringBuffer class . It returns the quantity of storage present for recently inserted characters, after which an allocation occurs.Declaration-The java.lang.StringBuffer.capacity() method is declared as follows−public int capacity()Let us see an example program showing how to get the capacity of the StringBuffer Object.Example Live Demoimport java.lang.*; public class Example { public static void main(String[] args) { StringBuffer b = new StringBuffer(“Hello”); // returns the current capacity of the String buffer which is 16 + 5 = 21 System.out.println("Capacity for the StringBuffer Object = " + b.capacity()); } }OutputCapacity for the StringBuffer Object = 21
In order to change the default capacity of the StringBuffer Object, we use the ensureCapacity() method. When the current capacity is less than the parameter passed, then a new internal array is allocated with greater capacity.The new capacity is the larger of the minimumCapacity argument and twice the old capacity, plus 2. If the minimum capacity is non positive, then it remains dormant and does not take any action.Declaration-The java.lang.StringBuffer.ensureCapacity() method is declared as follows−public void ensureCapacity(int minimumCapacity)Let us see the working of the ensureCapacity() methodExample Live Demopublic class Example { public static void main(String[] args) { ... Read More
Use the lastIndexOf() method to find the last occurrence of a character in a string in Java.Let’s say the following is our string.String myStr = "Amit Diwan";In the above string, we will find the last occurrence of character ‘i’myStr.lastIndexOf('i');The following is the complete example.Example Live Demopublic class Demo { public static void main(String[] args) { String myStr = "Amit Diwan"; int strLastIndex = 0; System.out.println("String: "+myStr); strLastIndex = myStr.lastIndexOf('i'); System.out.println("The last index of character a in the string: "+strLastIndex); } }OutputString: Amit Diwan The last index of character a in the string: 6Read More
Use the indexOf() method to search for a character from a given position.Let’s say the following is our string.String myStr = "Amit Diwan";Here, we are searching for the character “i” in the string. We are beginning the index from 4 for our search.int begnIndex = 4; System.out.println("String: "+myStr); strLastIndex = myStr.indexOf('i', begnIndex);The following is the complete example.Example Live Demopublic class Demo { public static void main(String[] args) { String myStr = "Amit Diwan"; int strLastIndex = 0; int begnIndex = 4; System.out.println("String: "+myStr); strLastIndex = myStr.indexOf('i', begnIndex); System.out.println("The index of character a in the string beginning from index "+begnIndex+" ="+strLastIndex); ... Read More
Use the indexOf() method to search for a substring from a given position.Let’s say the following is our string.String myStr = " pqrstuvwxyzpqrst";Searching for the substring “pqrs” in the string. We are beginning the index from 3 for our search.int begnIndex = 3; strLastIndex = myStr.indexOf("pqrs", begnIndex);Example Live Demopublic class Demo { public static void main(String[] args) { String myStr = "pqrstuvwxyzpqrst"; int strLastIndex = 0; int begnIndex = 3; System.out.println("String: "+myStr); strLastIndex = myStr.indexOf("pqrs", begnIndex); System.out.println("The index of substring pqrs in the string beginning from index "+begnIndex+" = "+strLastIndex); } }OutputString: pqrstuvwxyzpqrst The index of substring pqrs ... Read More
To display the position of a Substring in Java, we use the lastindexOf() method in Java. The lastindexOf() method returns the rightmost occurrence of the substring within a particular StringBuffer object.If the substring occurs more than once in the StringBuffer object, the index of the first character of the rightmost occured substring is returned. If the substring is not found, the lastIndexOf() method returns -1.Declaration − The java.lang.StringBuffer.lastIndexOf() method is declared as follows−public int lastIndexOf(String s)where s is the substring whose index needs to be foundLet us see a program which displays the position of a Substring.Example Live Demopublic class Example ... Read More
In order to change a single character in a StringBuffer object in Java, we use the setCharAt() method. The setCharAt() method sets the character at the index specified as a parameter to another character whose value is passed parameter of the setCharAt() method. The method sets a new character sequence with the only change being the character passed as the parameter at the specified index.Declaration - The java.lang.StringBuffer.setCharAt() method is declared as follows−public void setCharAt(int index, char ch)If index is greater than the length of the StringBuffer object or is negative, an IndexOutOfBoundsException is generated.Let us see a program to ... Read More
To get the arc sine of a given value in Java, we use the java.lang.Math.asin() method. The asin() method accepts a double value whose angle needs to be computed. The range of the angle returned lies in the range -pi/2 to pi/2. If the argument is NaN, then the result is NaN.When the argument is zero, then the output is a zero with the same sign as the argument.Declaration − The java.lang.Math.asin() method is declared as follows−public static double asin(double a)where a is the value whose arc sine is computed.Let us see a program to get the arc sine of ... Read More
In order to remove a character from a Java StringBuffer object, we use the deleteCharAt() method. The deleteCharAt() removes the character at the specified index. The length of resultant sequence of characters of the StringBuffer object is reduced by one.Declaration − The java.lang.StringBuffer.deleteCharAt() method is declared as follows−public StringBuffer deleteCharAt(int index)Let us see a program to illustrate the use of the deleteCharAt()Example Live Demopublic class Example { public static void main(String[] args) { StringBuffer sb = new StringBuffer("Hello World"); sb.deleteCharAt(7); System.out.println(sb); } }OutputHello Wrld
To return all the default systems properties in Java, firstly use the System.getProperties() method.java.util.Properties prop = System.getProperties();After that, use the list() method to list all of them.prop.list(System.out);Example Live Demopublic class Demo { public static void main(String[] args) { java.util.Properties prop = System.getProperties(); System.out.println("Here are the Properties:"); prop.list(System.out); } }OutputHere are the Properties: java.runtime.name=OpenJDK Runtime Environment sun.boot.library.path=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0... java.vm.version=25.141-b16 java.vm.vendor=Oracle Corporation java.vendor.url=http://java.oracle.com/ path.separator=: java.vm.name=OpenJDK 64-Bit Server VM file.encoding.pkg=sun.io user.country=US sun.java.launcher=SUN_STANDARD sun.os.patch.level=unknown java.vm.specification.name=Java Virtual Machine Specification user.dir=/home/cg/root/3757524 java.runtime.version=1.8.0_141-b16 java.awt.graphicsenv=sun.awt.X11GraphicsEnvironment java.endorsed.dirs=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0... os.arch=amd64 java.io.tmpdir=/tmp line.separator= java.vm.specification.vendor=Oracle Corporation os.name=Linux sun.jnu.encoding=UTF-8 java.library.path=/home/cg/root/GNUstep/Library/Librari... java.specification.name=Java Platform API Specification java.class.version=52.0 sun.management.compiler=HotSpot 64-Bit Tiered Compilers os.version=3.10.0-862.9.1.el7.x86_64 user.home=? user.timezone= java.awt.printerjob=sun.print.PSPrinterJob ... Read More