if else在大部份編程語言中都是這樣使用的，我們今天來簡單的介紹一下關于jsp教程 中的if else 與多重條件判斷。
<HTML>
<HEAD>
<TITLE>Using the if Statement</TITLE>
</HEAD>
<BODY>
<H1>Using the if Statement</H1>
<%
int value = 10;
if(value > 0)
out.println("Absolute value of " + value + " = " + value);
%>
</BODY>
</HTML>
簡單對比
<HTML>
<HEAD>
<TITLE>Using Compound Statements</TITLE>
</HEAD>
<BODY>
<H1>Using Compound Statements</H1>
<%
int value = 10;
if(value > 0) {
out.println("The number was positive.");
out.println("Absolute value of " + value + " = " + value);
}
%>
</BODY>
</HTML>
if else
<HTML>
<HEAD>
<TITLE>Nested if Statements</TITLE>
</HEAD>
<BODY>
<H1>Nested if Statements</H1>
<%
double value = 2;
if (value != 0) {
if (value > 0)
&nbs
<HTML>
<HEAD>
<TITLE>Using an if-else Ladder</TITLE>
</HEAD>
<BODY>
<H1>Using an if-else Ladder</H1>
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