> Apex中文手册 > if ... else语句

if-else语句

if语句后面可以有一个可选的else语句,当布尔表达式为false时执行。


语法:

if boolean_expression {
   /* statement(s) will execute if the boolean expression is true */
} else {
   /* statement(s) will execute if the boolean expression is false */
}
如果布尔表达式的计算结果为true,则将执行if代码块,否则将执行代码块。


流程图:


if ... else语句


示例:
假设,我们的化工公司有两类客户:高级和正常。 根据客户类型,我们应该提供折扣和其他好处,如售后服务和支持。 下面是这个的实现。
//Execute this code in Developer Console and see the Output
String customerName = 'Glenmarkone'; //premium customer
Decimal discountRate = 0;
Boolean premiumSupport = false;
if (customerName == 'Glenmarkone') {
    discountRate = 0.1; //when condition is met this block will be executed
    premiumSupport = true;
    System.debug('Special Discount given as Customer is Premium');
}
else {
    discountRate = 0.05; //when condition is not met and customer is normal
    premiumSupport = false;
    System.debug('Special Discount Not given as Customer is not Premium');
}
由于“Glenmarkone”是一个高级客户,所以if块将基于条件执行,在其余情况下,else条件将被触发。
上一篇:
下一篇: