JAVA程序设计(习题)

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1、.《JAVA程序设计》练习题写出下面程序的运行结果1、importjava.io.*;publicclassabc{publicstaticvoidmain(Stringargs[]){ABs=newAB("Hello!","IloveJAVA.");System.out.println(s.toString());}}classAB{Strings1;Strings2;publicAB(Stringstr1,Stringstr2){s1=str1;s2=str2;}publicStringtoString(){returns1+s2;}}运行结

2、果：Hello!IloveJAVA2、importjava.io.*;publicclassabc{publicstaticvoidmain(Stringargs[]){inti,s=0;inta[]={10,20,30,40,50,60,70,80,90};..for(i=0;i

3、tringargs[]){System.out.println("a="+a+"b="+b);}}classSubClassextendsSuperClass{intc;SubClass(intaa,intbb,intcc){super(aa,bb);c=cc;}}classSubSubClassextendsSubClass{inta;SubSubClass(intaa,intbb,intcc){super(aa,bb,cc);A=aa+bb+cc;}voidshow(){System.out.println("a="+a+"b="+b

4、+"c="+c);}}..运行结果：a=60b=20c=304、以下程序的输出结果为_Peteris17yearsold！________________。publicclassPerson{Stringname;intage;publicPerson(Stringname,intage){this.name=name;this.age=age;}publicstaticvoidmain(String[]args){Personc=newPerson("Peter",17);System.out.println(c.name+"is"+c.a

5、ge+"yearsold!");}}5、以下程序的输出结果为__课程号：101课程名:ASP学分:3___________________。publicclassCourse{privateStringcNumber;privateStringcName;privateintcUnit;publicCourse(Stringnumber,Stringname,intunit){cNumber=number;cName=name;cUnit=unit;}publicvoidprintCourseInfo(){System.out.println("

6、课程号:"+cNumber+"课程名:"+cName+"学分:"+cUnit);}..}classCourseTest{publicstaticvoidmain(String[]args){Coursec;c=newCourse("101","ASP",3);c.printCourseInfo();}}6、以下程序的输出结果为__汤姆猫体重：20.0斤___________________。publicclassTom{privatefloatweight;privatestaticStringname;publicvoidsetWeight(f

7、loatweight){this.weight=weight;}privatevoidout(){System.out.println(name+"体重："+weight+"斤");}publicstaticvoidmain(String[]args){Tom.name="汤姆猫";Tomcat=newTom();cat.setWeight(20);cat.out();}}7、以下程序的输出结果_姓名：Tom年龄：15家庭住址：金水区电话：_66123456学校：九中_______________。publicclassFather{..Stri

8、ngname,address,tel;intage;publicFather(Stringname,intage){this.name=