String Tokenizer |String Splitter | Java Tutorial

The string tokenizer class allows an application to break a string into tokens. The tokenization method is much simpler than the one used by the StreamTokenizer class. The StringTokenizer methods do not distinguish among identifiers, numbers, and quoted strings, nor do they recognize and skip comments.

String Tokenizer Tutorial video

Create GUI Java Swing using Eclipse

Right-click on the Eclipse project in the Package Explorer
• On the context menu select “New / Class”.
• Set ‘Source folder’ to Calculator/src
• Set the ‘Package’ to calculator.
• Set the ‘Name’ to View
• Set Modifiers to public
• Set Superclass to javax.swing.JFrame
• Click fnish

Now open GUI class and bottom tab switch to Design

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Add spaces in a String using Java

If u would like to print String "123" as "1 2 3" then follow this code.

yourString.replace("", " ").trim();

Above code just replacing all empty place with Space & remove starting space with trim           method

Add leading zeros for binary conversion in java

If u convert Decimal 15 to binary,you will get  Binary 1110 So you may want to add leading zero Ex:00001110

Step1:Find how many zeros do you need ?

if your input is16 then log2 16=4 zeros
if your input is 15 then log2 15=3 zeros not correct :-) So check 3 mod 2  !=0 and add one to it 3+1=4



int zeros=0;        
zeros=(int) (Math.log(input)/ Math.log(2));
if (zeros%2!=0) zeros=zeros+1;


Step2:Add these zeros to your binary output


String formatted=String.format("%0"+zeros+"d\n", Integer.parseInt(Integer.toBinaryString(count)));
System.out.println(formatted);

logarithm base 2 calculation in java

By default java provides base 10 using In build Math class


Base 10 log


Math.log(input) ;

Base 2 log

Math.log(input) / Math.log(2);

This methods will return values in double so if you need integer 

int zeros=(int) (Math.log(input)/ Math.log(2));