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Java cheat sheet Cheat Sheet by

java     muids

Numbers

Byte mybyte = 2;
8bits / 1byte
Short myshort = 200;
16bits / 2byte
Int my int = 1000000;
32bits / 4byte
Long mylong = 999999
64bits / 8byte
Double my double = 1.5;
64bits / 8byte
Float myfloat = 1.5;
32bits / 4byte
 

Object

Class
a blue print for an object
Object
a instance of a class
Package
Organi­zation of class

Swap

Public class Main {


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

        for (int i : list){
            System.out.println(i);
        }

    }

    public static void main(String[] args) {
        int[] mylist = new int[]{1,2,3,4,5};

        swap(mylist, 1, 2);

    }
}
 

Vocab

Program Execution
Running program
Java Bytecodes
the instru­ction set of the Java virtual machine.
Java Virtual Machine (JVM)
an abstract computing machine that enables a computer to run a Java program.

Function

System.ou­t.p­rint()
print
System.ou­t.p­rin­tln()
print in the same line
public static
modifier
int
return type
charAt()
Returns the character at the specified index.
Booleans.
True of False

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