Java Basic syntax

The last time we talked about basic type conversions in Java and some common operators, today we talk about the underlying syntax in Java

Java Basic Syntax:

Conditional statements------Execute different statements according to different conditions;

If

If.. Else

If.. else if

If.. else if: else.. If.. Else

Switch

Loop statements-----repeat certain actions;

for (JDK1.5 syntax)

While

Do.. While

If statement:

If

If.. Else

If.. else if

If.. else if: else if;

If.. else if: else if: Else

Only one sentence that needs to be executed is to omit {} but not recommended;

Be careful not to add ";" After the IF ;

For Loop statement:

for (expression 1; expression 2; expression 3) {statement; ...;}

Example of a For loop statement:

Prime numbers in the output 101~200:

While & does while statement:

While statement:

while (logical expression) {statement; ...;}

Do While statement:

Do while{statement, ...;} while (logical expression);

Break & Continue

The break statement is used to terminate the execution of a block of statements in the body of a loop statement: for example:

Results:

The continue statement is used in the Loop statement body to terminate a cyclic process,

Skips a loop that is not executed under the Continue statement for example;

Results:

Switch statement (conditional statement supplement):

Switch () {

Case XX:

......

Case XX:

......

Case XX:

.....

}

Note: It is recommended to use the break statement for case penetration;

Default can be omitted, but omitted is not recommended;

The value inside the Switch "()" must be of type int, but Byte, Short,char is OK, because they are automatically converted to int.

Java Basic syntax