if else在大部份编程语言中都是这样使用的，我们今天来简单的介绍一下关于jsp教程 中的if else 与多重条件判断。

Using the if Statement

int value = 10;

if(value > 0)
out.println("Absolute value of " + value + " = " + value);
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简单对比

Using Compound Statements

int value = 10;

if(value > 0) {
out.println("The number was positive.");
out.println("Absolute value of " + value + " = " + value);
}
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if else

Nested if Statements

double value = 2;

if (value != 0) {
if (value > 0)
out.println("The result = " + (1 / value));
else
out.println("Sorry, we need a positive number.");
}
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多个条件if else

Using an if-else Ladder

String day = "Friday";

if(day == "Monday")
out.println("It's Monday.");
else if (day == "Tuesday")
out.println("It's Tuesday.");
else if (day == "Wednesday")
out.println("It's Wednesday.");
else if (day == "Thurssday")
out.println("It's Thursday.");
else if (day == "Friday")
out.println("It's Friday.");
else if (day == "Saturday")
out.println("It's www.111com.net/5230/ Saturday.");
else if (day == "Sunday")
out.println("It's Sunday.");
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