Hand-punched notes, input and output in Java syntax, statements, and annotations.

Hand-Punched notes:

() is a note or a reminder

public static void Main (string[] args) ****** (with one method) * * * *
{
int i = 10;

int j = 20;

System.out.println (i = = j);

With and relations:

System.out.println (True & True);

System.out.println (True & false);

System.out.println (False & True);

System.out.println (False & False);

System.out.println (i >0 && j>0);

OR or relationship:

System.out.println (True | | true); (Short circuit wording, as long as the front face, it is all right) (and the opposite)

Non -:

SYSTEM.OUT.PRINTLN (! ( I < 0));

BYTE has eight bits

00000010

SYSTEM.OUT.PRINTLN (2 << 2); (00001000) Move left several depending on the latter one

3 2 = 12 3 and 2 What is the symbol equation set up

Left shift Operation Law:

X << y = x * 2 y-square

Move right to left shift opposite

Ternary operator: (cannot exist alone, assignment or output) (can be set to write)

System.out.println (i>0? "I is greater than 0": "I is less than or equal to 0"); (like if Else variant)

String str = "";

if (j>10)
{
str = "J greater than 10";
}
Else
{
str = "J not greater than 10";
}

str = J >10? "J Greater than ten": "J is not greater than 10";

System.out.println (str);

Manual input via console:

System.in input Stream

System.out output stream

Scanner SC =new Scanner (system.in); (instanced input scanner)

System.out.print ("Please enter Name:");

String Strin = Sc.nextline (); (Wait for input)

System.out.println ("The name you entered is:" + Strin); (output accepted)

Addition Calculator: (Other calculation types are optional)

System.out.print ("Please enter the first number:");

Long a =sc.nextlong ();

System.out.print ("Please enter a second number:");

Long b =sc.nextlong ();

System.out.println (A+B);

Branch statements:

int i = 10;

if (i>0)
{
SYSTEM.OUT.PRINTLN ("conditions established")
}
Else
{
SYSTEM.OUT.PRINTLN ("condition not established")
}

if (i>0) System.out.println ("i>0"); (Simplified notation)

if (i>0)
{
SYSTEM.OUT.PRINTLN ("conditions established")
}
else if (i>5)
{
SYSTEM.OUT.PRINTLN ("condition not established")
}

Else

{

}

Switch statement: (Support type: int byte char Short enumeration string)

Switch (i)

{

CASE1: (Must be constant after case)

System.out.println ("1");

Break

CASE2:

System.out.println ("4");

Break

CASE3:

System.out.println ("6");

Break

Default

System.out.println ("123");
}

Cycle:

i=10;

while (i>0)
{
System.out.println ("i =" +i);

i--;
}

Do

{
System.out.println ("i =" +i);

i--;

}

while (i>0);

for (i=0;i<10;i++)

{
System.out.println ("i =" +i);


if (i==2)
{
Continue (Skip execution later)
}

if (i==5)
{
Break
}
}

}

Hand-punched notes, input and output in Java syntax, statements, and annotations.