《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(){return

2、s1+s2;}}运行结果：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、ublicstaticvoidmain(Stringargs[]){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(){S

4、ystem.out.println("a="+a+"b="+b+"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("Pe

5、ter",17);System.out.println(c.name+"is"+c.age+"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

6、=unit;}publicvoidprintCourseInfo(){System.out.println("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

7、{privatefloatweight;privatestaticStringname;publicvoidsetWeight(floatweight){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

8、_姓名：Tom年龄：15家庭住址：金水区电话：_66123456学校：九中_______________。publicclassFather{Stringname,address,tel;intage;publicFather(Stringname,intage){this.name=name;this