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一：当代码中可能会遇到的异常需要用try{ }catch{Exception e}来处理，否则导致程序崩溃
try{
int i = 1/0;
}catch(Exception e){
........
}
二：不要在for循环里面嵌套try catch子句
for (int i = 0; i < array.length; i++) {
try {
.......
} catch (IOException e) {
.......
} catch (Exception e) {
.......
}
}
改成：
try {
for (int i = 0; i < array.length; i++) {
.......
}
} catch (IOException e) {
.......
} catch (Exception e) {
.......
}
三：尽可能的减少try catch子句的嵌套，会影响性能
try {
try {
.......
} catch (IOException e) {
.......
}
} catch (Exception e) {
.......
}
改成
try {
.......
}catch (IOException e) {
.......
} catch (Exception e) {
.......
}
四：同一个try子句中多个catch时，异常处理原则
当一个try块中包含众多语句，可能抛出多种不同的异常，只有通过多个catch块来捕获不同的异常。而如果两个异常存在继承关系，应该把子类异常放在你父类异常的前面来捕获，或者把最小范围异常放在最前面
，范围大的放在后面，因为是按照catch块从上往下匹配，当它匹配某一个catch块的时候，他就直接进入到这个catch块里面去了，后面在再有catch块的话，它不做任何处理，直接跳过去，全部忽略掉。如果有finally的话进入到finally里面继续执行。Exception这个异常的根类一定要刚在最后一个catch里面，如果放在前面或者中间，任何异常都会和Exception匹配的，就会报已捕获到...异常的错误。同时配合log4j使用会对程序的日后维护帮助很大。
try {
.......
}catch (IOException e) {
.......
} catch (Exception e) {
.......
}
