Java Applet Getting Started 8

zhaozj2021-02-11  201

Getting started with Java Applet

YY435

Pacific Network Academy

the next day

5, process control statement

The statement that can determine the execution order of other statements is called the flow control statement. There is a statement in the Java language:

Select judgment statement: IF-else, Switch-Case

Circular statement: for, while, do-while

Abnormal throw and capture statement: try-catch-finally, throw

Control statement: Break, Continue, Label:, Return

First, choose judgment statement

Two forms:

1. IF statement

IF (expression)

or

IF (condition), ELSE

They are cooked, such as:

IF (testscore> = 90) {grade = 'a';} else if (testscore> = 80) {grade = 'b';} else f (testscore> = 70) {grade = 'c';} else f Testscore> = 60) {grade = 'd';} else {grade = 'f';}

2, Switch statement

Switch (Expression or Variable) {CASE The first choice of possible: then ...; Break; Case second selection possible: then ...; Break; Case third selection possible: then ......; ... default: then Break;}

two. loop statement

1. FOR cycle

For (Initialization; Termination; Increment) Statements

2. While cycle

While (BooleaneXpression) Statements

3. Do-while loop

DO {statements }wide; booleaneXpression;

3. Transfer statement

1. Scriptomed statement format:

Number: SOMEJAVASTATEMENT;

2.BREAK statement

Break statement without a label: Terminate the execution of the current statement to move the control to the next statement of the current statement. BREAK statement with reference numerals: Terminate the label statement to make the control transfer to the next statement of the marker statement. Break StatementName ;

3.Continue statement

You can only use in a loop statement. Continue statement without a label: unconditional make the control to the condition determination section of the loop statement. Condinue statement with reference numerals: unconditionally transferred to the condition determination section of the loop statement of the band mark.

4. RETURN statement:

End the execution of the current method and return to the next statement of the call method statement. Return Expression; Return;

Ok, give you an example. as follows:

The source code of the program is as follows:

Import java.applet. *;

Import java.awt. *;

Public Class Applet1 Extends Applet

{

Public void Paint (Graphics G)

{

INT i = 1, J, N = 5;

While (i <= n)

{

For (j = 1; j <= i * 2-1; j )

g.drawstring ("*", (100

10 * J 10 * (N-I)), i * 20); i ;

}

}

}

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