Java Design Practice Lesson Exercises

1 Package Hello;2Import java.util.*;3 4  Public classHello {5      Public Static voidMain (String args[]) {6         Double[] A = produce (10000);7         int[] B =Tongji (a);8          for(inte:b) {9System. out. Print (E +" ");Ten         } OneSystem. out. println (); A         DoubleExp =expect (a); -System. out. println (exp); -         Doublef =Fangcha (exp, a); theSystem. out. println (f); -          -     } -      Public Static Double[] Produce (intlength) { +         Double[] A =New Double[length]; -          for(inti =0; i < length; i++) { +A[i] = math.random () *2-1; A         } at         returnA; -     } -      Public Static int[] Tongji (Doublea[]) { -         int[] B =New int[ -]; -          for(inti =0; i < a.length; i++) { -              for(intj =0; J < B.length; J + +) { in                 if(A[i] >-1+0.1* J && A[i] <-1+0.1* (j +1)) { -b[j]++; to                 } +             } -         } the         returnb; *     } $      Public Static DoubleExpectDoubleb[]) {Panax Notoginseng         Doublesum =0; -          for(inti =0; i < b.length; i++) { thesum = sum +B[i]; +         } A         DoubleExp = sum/10000; the         returnexp; +     } -      Public Static DoubleFangcha (DoubleExpDoublea[]) { $         Doublesum =0; $          for(inti =0; i < a.length; i++) { -sum = sum + (A[i]-exp) * (A[i]-exp); -         } the         Doublef = math.sqrt (sum/10000); -         returnF;Wuyi     } the}

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1 Package Hello;2Import java.util.*;3 4  Public classHello {5      Public Static voidMain (String args[]) {6         Double[] A = produce (10000);7         int[] B =Tongji (a);8          for(inte:b) {9System. out. Print (E +" ");Ten         } OneSystem. out. println (); A         DoubleExp =expect (a); -System. out. println (exp); -         Doublef =Fangcha (exp, a); theSystem. out. println (f); -          -     } -      Public Static Double[] Produce (intlength) { +         Double[] A =New Double[length]; -          for(inti =0; i < length; i++) { +A[i] =getnumrandom (); A         } at         returnA; -     } -      Public Static int[] Tongji (Doublea[]) { -         int[] B =New int[ -]; -          for(inti =0; i < a.length; i++) { -              for(intj =0; J < B.length; J + +) { in                 if(A[i] >-6+0.6* J && A[i] <-6+0.6* (j +1)) { -b[j]++; to                 } +             } -         } the         returnb; *     } $      Public Static DoubleExpectDoubleb[]) {Panax Notoginseng         Doublesum =0; -          for(inti =0; i < b.length; i++) { thesum = sum +B[i]; +         } A         DoubleExp = sum/10000; the         returnexp; +     } -      Public Static DoubleFangcha (DoubleExpDoublea[]) { $         Doublesum =0; $          for(inti =0; i < a.length; i++) { -sum = sum + (A[i]-exp) * (A[i]-exp); -         } the         Doublef = math.sqrt (sum/10000); -         returnF;Wuyi     } the      Public Static DoubleGetnumrandom () { -         Doublesum =0; Wu          for(inti =0; I < A; i++) { -sum = sum +math.random (); About         } $         returnSum-6; -     } -}

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Java Design Practice Lesson Exercises