Conditional statements, loops, arrays

First, conditional statements

If statement

if (condition 1) {

Code 1

}

else if (condition 2) {

Code 2

}

......

else{

Code n

}

Switch statement

Not commonly used, only the following types of comparisons are supported: String, Char, Boolean, enum, integer

Second, the circular statement

While structure

while (loop condition) {

Loop body

}

Loop control statement:break: End the entire loop immediately

　　　　　　　continue: Immediately ends the current number of loops and runs the next loop

Do.. While structure

do{Loop Body}

while (cyclic condition);

For structure

for (expression 1; loop condition; expression 2) {

Loop body

}

Three, array

Arrays: Used to hold multiple data of the same type

After an array is created, each entry must have a value, and if no assignment is made, the default value is used.

Number type: Default value is 0

String: Default value is null

Boolean type: Default value is False

Char type: The default value is

Array traversal: Gets the data for an item in the array, typically using a for loop, which overrides all subscripts of the array

foreach loop: can only be used to iterate over an array or collection, only in sequential traversal, with fast traversal speed

Iv. Functions (function)

Functions must be declared before they are used:

Modifier return type function name (formal parameter list) {function Body}

Formal parameter list: data type parameter name

Function call: Function name (argument list);

Parameters: Arguments used when declaring a function

Arguments: Parameters used when a function is called

When a function is called, the value of the argument is passed to the parameter.

　　　　

Conditional statements, loops, arrays