【判断题】无烟煤这种煤炭气化时黏结,并且产生焦油,煤气中的不饱和烃、碳氢化合物较多,煤气净化系统较复杂,煤气的热值较高。
【单选题】给出以下语句: class Parent{ String one,two; public Parent(String a,String b){ one=a; two=b; } public void print(){System.out.println(one);} } public class Child extends Parent{ public Child(String a,String ...
C.
south to north east to west
【多选题】public class Parent { int change() {…} } class Child extends Parent { } Which methods can be added into class Child?()
C.
private int change(){}
D.
abstract int chang(){}
【单选题】运行以下代码:public class TestPoly{public static void main(String[] args){ Parent p=new Child( ); }}class Parent{ public Parent( ){super( );System.out.println(“instantiate a parent“);}}class Child extends P...
C.
instantiate a child instantiate a parent
D.
instantiate a parent instantiate a child
【单选题】下面程序的运行结果为哪个? class Parent { void printMe( ) { System.out.println("parent"); } } class Child extends Parent { void printAll( ) { System.out.println("parent " + "child"); } } public class Test {...