Java 复习题样.doc

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1、二、读程序题，写出程序的执行结果（每小题4分，共16分）1publicclassA{staticvoidprt(charc){System.out.print("char"+"");}staticvoidprt(inti){System.out.print("int"+"");}staticvoidprt(floatf){System.out.print("float"+"");}publicstaticvoidmain(String[]args){prt(‘c’);intf=5;prt(f);}}2.classParent{voidf(){System.out.prin

2、t("InParent");}}classChild1extendsParent{voidf(){System.out.print("InChild1;");}}classChild2extendsParent{}classTest{publicstaticvoidmain(Stringargs[]){Parentp=newChild1();p.f();p=newChild2();p.f();}}3.classParent{Strings="Parent";voidprnt(){System.out.print(s+";");}}classChildextendsPare

3、nt{Strings="Child";voidprnt(){System.out.print(s+";");}}classTest{publicstaticvoidmain(Stringargs[]){Parenta=newParent();a.prnt();Parentc=newChild();c.prnt();}}4.classParent{publicParent(){this(1);System.out.print("Parent中的无参构造方法"+";");}publicParent(inti){System.out.print("Parent中的有参构造方法"

4、+";");}}classChildextendsParent{publicChild(){this(1);System.out.print("Child中的无参构造方法"+";");}publicChild(inti){super();System.out.print("Child中的有参构造方法"+";");}}classTest{publicstaticvoidmain(Stringargs[]){newChild();}}二、读程序题，写出程序的执行结果（每小题4分，共16分。答案直接写在空白处。）1.publicclassTestReLoad{publicsta

5、ticintjueDuiZhi(inta){System.out.println("jueDuiZhi(int)");returna>0?a:-a;}publicstaticdoublejueDuiZhi(doublea){System.out.println("jueDuiZhi(double)");returna>0?a:-a;}publicstaticfloatjueDuiZhi(floata){System.out.println("jueDuiZhi(float)");returna>0?a:-a;}publicstaticvoidmain(String[]ar

6、gs){jueDuiZhi(1);jueDuiZhi(5.0);}}2.classFather{publicFather(){System.out.println("Father构造方法");}}classSonextendsFather{publicSon(){System.out.println("Son构造方法");}publicstaticvoidmain(Stringargs[]){newSon();}}3.interfaceHisInterface{publicvoidg();}classClassAimplementsHisInterface{publicv

7、oidg(){System.out.println("ClassA.g()");}}classClassBimplementsHisInterface{publicvoidg(){System.out.println("ClassB.g()");}}classEx{publicstaticvoidmain(Stringargs[]){HisInterfaceh=newClassA();h.g();h=newClassB();h.g();}}4.classFather{Stringa="Father_a";Stringb="Fa