JAVA introductory system tutorial (4) Basic syntax (2)

                                                                                                              # Basic Assignment operator: = Extended assignment operator: =,-=,*=,/=,%= (Convert the value on the left side of the equal sign to the equal sign The result of addition/subtraction on the right side is assigned to the variable on the left side of the equal sign)

We can see that a = 10 here is equivalent to a = a 10

2. Keyboard input: Provide a class through java --- Scanner: text scanner Basic format:

Scanner scanner = new Scanner(System.in);

will have an error at this time. Here we need to import a package, write between Package and Class

stet number = scanner.nextint (); [call the scanner method]

Here we give an example: Find the maximum value of the three entered numbers

3. Logical operators

Basic logical operators : Logical AND - & , Logical OR - | , Logical OR - ^ , Logical NOT -!

&: If false, then false |: If true, then true

^: Same as false, different as true

!: If not false, then true, if not true, then false, An even number is not itself

The difference between && and &: If false appears first, the subsequent ones will not be executed, which is the effect of the break

The difference between || and |: If true appears first, then the subsequent ones will The non-execution is the effect after interruption

4. Arithmetic operators

,-,*,/,% (remainder)

/--increment by 1 or decrement by 1

Special: If /--data comes before to participate in the operation: increase by 1 or decrement by 1 first , then perform the operation (assignment)

If // participate in the operation after the data: first perform the operation (assignment), and then participate in the operation

5. Ternary operator:? true: false

Example: Compare three numbers

##6. Select the if statement of the structural statement

1) if (conditional sentence) {｝

Example: Enter a number, output the result when it is greater than 8, and end when it is less than 8.

2) if(){}else / if(){}else if

if(statement){statement 1}else{ Statement 2}

Example: Enter 1-24 to determine the period is morning, afternoon and evening

#END

#Related articles:

JAVA Getting Started System Tutorial (2) Installing and Using eclipse

JAVA Getting Started System Tutorial (3) Basic Grammar (1)

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