Java Exercises with answers

First question int x = 1,y=1;if (x++==2 & ++y==2) {x = 7;} System.out.println ("x=" +x+ ", y=" +y);//x=2,y=2---------------------------------------------------second question int x = 1,y = 1; if (x++==2 && ++y==2) {x = 7;} System.out.println ("x=" +x+ ", y=" +y); X=2,y=1---------------------------------------------------third question int x = 1,y = 1;if ( X++==1 | ++y==1) {x = 7;} System.out.println ("x=" +x+ ", y=" +y); x=7,y=2---------------------------------------------------question Fourth int x = 1,y = 1;if ( X++==1 | | ++y==1) {x = 7;} System.out.println ("x=" +x+ ", y=" +y);//x=7,y=1---------------------------------------------------question Fifth Boolean b = True;if (B=false)  //if written as if (b=false) have results? If so, what is the result? System.out.println ("a"), else if (b) System.out.println ("B"), else if (!b) System.out.println ("C"); ElseSystem.out.println ("D");//bif (b=false)//c---------------------------------------------------the sixth question int x = 2,y=3; Switch (x) {default:y++;case 3:y++;case 4:y++;} System.out.println ("y=" +y);//y=6

　　

11.2 the students are known to score 100 out of a total of 5 grades: A,b,c,d,e. 390~100 to rank a,80~89 for grade b,70~79 is Class C,460~69 to rank d,0~59 is level E. 5 requires defining a performance variable that, when the score changes, can be directly aware of the grade corresponding to that grade. 6 For example: When the score is 100, the student's grade is a. 7 8 classDemo9 {Ten     //defines a function that obtains the rank corresponding to the score by a given score.  One     /* A 1, clear the result of this function: Rank char - 2, there is no unknown content. Scores. int -     */ the      Public StaticString Getlevel (intnum) -     { -         CharLevel ; -         if(Num>=90 && num<=100) +Level = ' A '; -         Else if(Num>=80 && num<=89) +Level = ' B '; A         Else if(Num>=70 && num<=79) atLevel = ' C '; -         Else if(Num>=60 && num<=69) -Level = ' D '; -         Else -Level = ' E '; -  in         returnLevel ; -     } to      Public Static voidMain (string[] args) +     { -          the         Charch = getlevel (35); *System.out.println ("level=" +ch); $     }Panax Notoginseng      - } the  +  A  the  +  -  $2. $ write out the results.  - classDemo - { the      Public Static voidMain (string[] args) -     {WuyiShow (0);// the theShow (1);// - -     }     Wu      Public Static voidShowinti) -     { About         Switch(i) $         {     -             default: -i+=2; -              Case1: AI+=1; +              Case4: theI+=8;  -              Case2: $I+=4; the         } theSystem.out.println ("i=" +i); the     }     the } -  in3. Writes out the result of the output. the classDemo the { About      Public Static voidMain (string[] args) the     { the         intX=0,y=1; the         if(++x==y--&x++==1| | --y==0) +System.out.println ("x=" +x+ ", y=" +y);//x=2,y=0 -         Else theSystem.out.println ("y=" +y+ ", x=" +x);Bayi     } the } the  -  -4. the find out between 1~100, even if 3 is another multiple of 7 occurrences?  the  the  the  -5. the The following results are displayed in a procedural way.  the  the1*1=1941*2=2 2*2=4 the1*3=3 2*3=6 3*3=9 the1*4=4 2*4=8 3*4=12 4*4=16 the1*5=5 2*5=10 3*5=15 4*5=20 5*5=2598  About  -6. Write out the program results. 101 102 classDemo103 {104      Public Static voidMain (string[] args) the     {106         intx = 1;107          for(Show (' A '); Show (' B ') && x<3; Show (' C ')))108         {109Show (' d ');  theX + +;111         } the     }113      Public Static BooleanShowCharch) the     { the System.out.println (CH); the         return true;117     }118 }119  - //a b d c b d C b

Java Exercises with answers