实验手册java基础补习

第一章开发环 实验 第二章标识符与关键 实验 第一个Java应用程 实验 import的用 第三章基本数据类 实验 实验 实验 实验 实验 第四章方法初 实验1方法的使 第五章运算符与表达 实验 实验 实验 实验 实验 第六章分支语 实验 if分支语 实验 if多重嵌套语 实验 switch用 第七章循环语 实验 for循 实验 while循 实验 do...while循 实验 break跳出多重循 实验 continue的使 第八章一维数 实验 实验 实验 实验 实验 第九章二维数 实验1测定数组的长 JavapublicclassTestpublicstaticvoidpublicclassTestpublicstaticvoidmain(String[]args){}} 第一个Java应用程JavapublicclassCommentpublicclassComment//*publicstaticvoidmain(String[]args)//System.out.println("这行将不会被编译、执行}} import的用import//import////import////importpublicclassTestpublicstaticvoidmain(String[]args){Stustu=newStu(100);}}publicclassStu{privateintage;publicpublicclassStu{privateintage;publicStu(intage){this.age=}publicvoidsetAge(intage){this.age=age;}publicintgetAge(){returnage;}} publicclassCharTestpublicclassCharTestpublicstaticvoidmain(String[]args)charc1=charcharc2='你charc3=charc4=System.out.println(c1+c3);}}「 publicclassDataOperpublicclassDataOperpublicstaticvoidmain(String[]args)//intdoubledoubled;inti=123;d=i;System.out.println("d="+//doubleintdoubled1=intj=(int)d1;System.out.println("j="+j);}}d=j= publicclassDataInExpresspublicclassDataInExpresspublicstaticvoidmain(String[]args)shorts=longl=System.out.println("输出结果是："+s*byteb=2;charc='a';intd=b+intifloatj=;}} JavapublicclassGlobalVarspublicclassGlobalVarsstaticinta=100;//doubled=12.34;//全局实例变量（成员变量}}classTestpublicstaticvoidmain(String[]args)//必须实例化GlobalVars后才可以 GlobalVarsgv=newGlobalVars();}} publicclassGlobalVarpublicclassGlobalVarintpublicvoidtest(){System.out.println(i+10);}publicstaticvoidmain(String[]args){GlobalVargv=newGlobalVar();}}1publicpublicclassDefinedMethod{Stringstr;publicvoidaMethod(){}publicvoidbMethod(Strings){str=s;System.out.println("stris:"+}publicintcMethod(inta,intb)intc=a+return}publicstaticvoidmain(String[]args){DefinedMethoddm=newDefinedMethod(); oworld");inti=dm.cMethod(1,2);}}stris:oworld 0publicclassDivTestpublicclassDivTestpublicstaticvoidmain(String[]args){System.out.println("21.0/0="+21.0/0);System.out.println("21/0="+21/0);}}21.0/0=Exceptioninthread"main"java.lang.ArithmeticException:/byzeroatcom.fs.test.DivTest.main(DivTest.java:7) publicclassModeTestpublicclassModeTestpublicstaticvoidmain(String[]args)inti=while(i<5){i=i%5;System.out.println("i="+i);}}}i=i=i=i=i= publicclassShortCircuitpublicclassShortCircuitpublicbooleanaMethod(){return1<2;//true}publicbooleanbMethod(){return1==2;//false}publicbooleancMethod(){return1>2;//false}publicstaticvoidmain(String[]args)ShortCircuitscnewShortCircuit();System.out.println(sc.aMethod()||sc.bMethod()||System.out.println("System.out.println(sc.aMethod()&&sc.bMethod()&&}} 掌握简单类型数据和类型数据的赋值操public privateint (int_age){age=_age;}publicvoidsetAge(int_age){age=_age;}publicintgetAge()return}}publicclassTestpublicclassTestpublicstaticvoidmain(String[]args)inta,b=a=b=System.out.println("a="+a);System.out.println("b="+p1=p2=p1;System.out.println("p1ageis:"+System.out.println("p2ageis:"+}}a=b=p1ageis:111p2ageis: publicclassStringPluspublicclassStringPluspublicstaticvoidmain(String[]args)doublex=9.99;doubley=1;doublez=x+y;Strings="Priceis:"+x;Stringt="TotalPriceis:"+z;System.out.println(""+x+y);System.out.println(x+y+"");}}Priceis:TotalPriceis:10.99 if分支语ifpublicclassTest publicstaticvoidpublicstaticvoidmain(String[]args)inta=10;intb=5;if(a>b){System.out.println("比较结果是：a>}elseSystem.out.println("比较结果是：a<}}}比较结果是：a if多重嵌套语ifpublicclassTestpublicclassTestpublicstaticvoidtestMethod(inta,intb,intc)if(a>b)if(a>c)System.out.println("a是最大的}elseif(a<c){System.out.println("b<a<c");}elseSystem.out.println("b<a=}}elseif(a<b)if(a>c)System.out.println("c<a<}elseif(a<c){}elseSystem.out.println("a=c<}}elseifif(a>c)System.out.println("c是最小的}elseif(a<c){System.out.println("a=b<c");}elseSystem.out.println("a=b=}}}publicstaticvoidmain(String[]args)testMethod(20,5,}}b<a< switch用switchpublicclassSwitchCaseDemopublicclassSwitchCaseDemopublicstaticvoidtestMethod(inta)intresult=0;switch(a){case1:System.out.println("ThisisA");result=a;case2:System.out.println("ThisisB");result=a*a;case3:System.out.println("ThisisC");result=a*a*a;case4:System.out.println("thisisD");result=a%4;result=}System.out.println("a="+a+"result="+}publicstaticvoidmain(String[]args)}}Thisisa= result= for循forpublicclassTestpublicclassTestpublicstaticvoidmain(String[]args)for(inti=0;i<10;i++){System.out.println("i="+i);}}}i=i=i=i=i=i=i=i=i=i= while循whilepublicclassTestpublicclassTestpublicstaticvoidmain(String[]args)inti=while(i<10){System.out.println("i="+i);}}}i=i=i=i=i=i=i=i=i=i= do...while循do...whilepublicclassTestpublicclassTestpublicstaticvoidmain(String[]args)inti=doSystem.out.println("i="+i);}while(i<}}i=i=i=i=i=i=i=i=i=i= 掌握break与结合的使publicclassTestpublicclassTestpublicstaticvoidmain(String[]args) for(inti=1;i<10;i++)forfor(intj=1;j<5;j++){System.out.println("i*j="+i*j);if(j==3)breakouter;//根 跳出循}}}}i*j=1i*j=2i*j= continue的使breakcontinuepublicclassTestpublicclassTestpublicstaticvoidmain(String[]args){for(inti=1;i<5;i++)for(intj=1;j<3;j++){System.out.println(i+"*"+j+"="+i*j);continueouter;//根据 }}}}1*1=2*1=3*1=4*1= publicclassTestpublicclassTestpublicstaticvoidmain(String[]args)int[]a=newint[5];a[0]=1;a[1]=a[2]=a[3]=a[4]=for(inti=0;i<a.length;i++){}}} publicclassTestpublicclassTestpublicstaticvoidmain(String[]args)int[]a=newint[]b=for(inti=0;i<a.length;i++)}for(inti=0;i<b.length;i++){}}} JavapublicclassTestpublicclassTestpublicstaticvoidsortMethod(int[]a){for(inti=0;i<a.length;i++){System.out.print(a[i]+"");}}publicstaticvoidmain(String[]args)int[]array=}}4910122945 JavapublicclassTestpublicclassTestpublicstaticvoidfindMethod(int[]a,intb){for(inti=0;i<a.length;i++){System.out.print(a[i]+"");}intres=Arrays.binarySearch(a,b);System.out.println("该元素的位置是：res);}publicstaticvoidmain(String[]args)int[]array=findMethod(array,}}4910122945 JavapublicclassTestpublicclassTestpublicstaticvoidmethod(Strings,String...name)for(inti=0;i<name.length;i++){}}pu