Set遍历

1.迭代遍历

Iterator<Object> iterator = set.iterator();    while (iterator.hasNext()) {        Object str = (Object)iterator.next();        System.out.print(str+"\t");    }

2.foreach遍历

for (Object object : set) {            System.out.print(object+"\t");        }

3.foreach选择遍历

        for (Object object : set) {            if(object instanceof Integer) {                int i = (Integer)object;//              System.out.print(i+"\t");            }else if(object instanceof String) {                String str = (String)object;                System.out.print(str+"\t");            }        }

通过instanceof运算符选择对象遍历