importjava.util.*;publicclassPQ{publicstaticvoidmain(String[]args){PriorityQueuepq=newPrio
A.apple:apple
B.carrot:apple
C.apple:banana
D.banana:apple
E.carrot:carrot
F.carrot:banana
A.apple:apple
B.carrot:apple
C.apple:banana
D.banana:apple
E.carrot:carrot
F.carrot:banana
A、? extends Collection <u>
B、? implements Collection<u>
C、T extends Collection<u>
D、T implements Collection<u>
A. Green,Red
B. Red,Green
C. Red,Blue
D. Green,Blue
有如下程序: #include <iostream> using namespace std; class TestClass { public: virtual void fun1( ) { cout<<"fun1testclass"< } virtual void fun2( ) { }; testclass1:public testclass fun1( fun2(int x) int main( obj1,*p; testclass1 obj2; p="&obj2;" p-> fun1(); p->fun2(); return 0; } 该程序执行后的输出结果是( )。
A、fun1TestClass1 fun2TestClass
B、fun1TestClass1 fun2TestClass1
C、fun1TestClass fun2TestClass
D、fun1TestClass fun2TestClass1
程序填空题: 从数据库student表中查询所有学生并放入ArrayList中。 Connection con=null; Statement stmt=null; ResultSet rs=null; String uri = "jdbc:mysql://localhost:3306/st"; List<student> list=new ArrayList<student>(); try { 【 1 】=DriverManager.getConnection(uri,"root",""); 【 2 】=con.createStatement(); rs=stmt.【 3 】(“【 4 】sname,sid,score from student”); while(rs.next()) { Student s=new Student(); s.sname=rs.【 5 】(“sname”); s.sid=rs.【 5 】(“sid”); s.score=rs.getFloat(“score”); list.add(s); } rs.close; stmt.close(); con.close(); } catch(SQLException e) { System.out.println(e.getMessage()); }
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