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InfinitePOS's Java cheat sheet Cheat Sheet by

programming     java     muids     infinitepos

Data Types

byte
8 bits
0
short
16 bits
0
int
32 bits
0
long
64 bits
0L
boolean
bit
false
char
16 bit unicode
x
float
32 bit decimal
0.0f
double
64 bit decimal
0.0d

(='w')/

Array : collection of values
String : immutable, arranged set of characters
Class : Blueprint of the object
Java Script : public class Main{
                         public static void main(string[] args){
                          }
                    }

\(='w'=)/

byte[ -128 to 128 ][-27 to 27 -1]
short[ -215 to 215-1]
int[-231 to 231-1]
long[-263 to 263-1]
 

Algorithm

An algorithm (pronounced AL-go-rith-um) is a procedure or formula for solving a problem.
Just like you have a recipe to cook food that has step-by-step instructions, in programming you have an algorithm that has step-by-step instructions.
Examples:
Sorting Algorithm
Swap Algorithm
Search Algorithm

Simple Algorithm to swap the values of two variables.

Examples:
  int a = 4;
  int b = 3;
  int temp = a; //back up the value of a
  a = b;
  b = temp;

Simple Algorithm to swap the values of two items in a list.

Examples:
 public static void swap(int[] list, int e1, int e2){
        int temp = list[e1];
        list[e1] = list[e2];
        list[e2] = temp;
 }
 

Decision Making

(if/else)

An if statement can be followed by an optional else statement, which executes when the Boolean expression is false.

Examples:
if(Boolean_expression 1){
   //Executes when the Boolean expression 1 is true
}else if(Boolean_expression 2){
   //Executes when the Boolean expression 2 is true
}else if(Boolean_expression 3){
   //Executes when the Boolean expression 3 is true
}else {
   //Executes when the none of the above conditions is true.
}

(Switch)

A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case, and the variable being switched on is checked for each case.

Examples:
switch(expression){
    case value :
       //Statements
       break; //optional
    case value :
       //Statements
       break; //optional
    //You can have any number of case statements.
    default : //Optional
       //Statements
}

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