2024年java基础第八版

大家好，我是讯享网，很高兴认识大家。

 1 package chapter4;  2  3 public class FutureTuition {  4 public static void main(String[] args){  5 double tuition = 10000;  6 int year = 1;  7 while (tuition < 20000){  8 tuition = tuition * 1.07;  9 year++; 10  } 11 System.out.println("Tuition will be doubled in " + year + " years"); 12  } 13 }

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讯享网 1 package chapter4;  2 //求最大公约数；  3 public class GreatestCommonDivisor {  4 public static void main(String[] args){  5 java.util.Scanner input = new java.util.Scanner(System.in);  6 System.out.print("Enter first integer: ");  7 int n1 = input.nextInt();  8 System.out.print("Enter second integer: ");  9 java基础第八版 int n2 = input.nextInt(); 10 11 int gcd = 1; 12 int k = 2; 13 while (k <= n1 && k <= n2){ 14 if (n1 % k == 0 && n2 % k == 0) 15 gcd = k; 16 k++; 17  } 18 System.out.println("The greatest common divisor for " + n1 + " and " + n2 + 19 " is " + gcd); 20  } 21 22 }

 1 package chapter4;  2  3 public class GuessNumber {  4 public static void main(String[] args) {  5 java.util.Scanner input = new java.util.Scanner(System.in);  6 int number = (int)(Math.random() * 101);  7  8 System.out.println("Guess a magic number between 0 and 100");  9 int guess = -1; 10 while (guess != number) { 11 System.out.print(" Enter your guess: "); 12 guess = input.nextInt(); 13 14 if (guess == number) 15 System.out.println("Yes, the number is " + number); 16 else if (guess > number) 17 System.out.println("Your guess is too high"); 18 else 19 System.out.println("Your guess is too low"); 20  } 21  } 22 }

讯享网 1 package chapter4;  2  3 public class GuessNumberOneTime {  4 public static void main(String[] args){  5 int number = (int)(Math.random() * 101);  6 java.util.Scanner input = new java.util.Scanner(System.in);  7 System.out.println("Guess a magic number between 0 and 100");  8 System.out.print(" Enter your guess: ");  9 int guess = input.nextInt(); 10 11 if (guess == number) 12 System.out.println("Yes, the number is " + number); 13 else if (guess > number) 14 System.out.println("Your guess is too high"); 15 else 16 System.out.println("Your guess is too low"); 17  } 18 }

 1 package chapter4;  2  3 public class GuessNumberUsingBreak {  4 public static void main(String[] args){  5 java.util.Scanner input = new java.util.Scanner(System.in);  6 int number = (int)(Math.random() * 101);  7 System.out.println("Guess a magic number between 0 and 100");  8  9 while (true){ 10 System.out.print(" Enter your guess: "); 11 int guess = input.nextInt(); 12 13 if (guess == number){ 14 System.out.println("Yes, the number is " + number); 15 break; 16  } 17 else if (guess > number) 18 System.out.println("Your guess is too high"); 19 else 20 System.out.println("Your guess is too low"); 21 22  } 23  } 24 }

 1 package chapter4;  2  3 public class MonteCarloSimulation {  4 public static void main(String[] args){  5 final int NUMBER_OF_TRIALS = ;  6 int numberOfHits = 0;  7  8 for (int i = 0; i < NUMBER_OF_TRIALS; i++){  9 double x = Math.random() * 2.0 - 1; 10 double y = Math.random() * 2.0 - 1; 11 if (x * x + y * y <= 1) 12 numberOfHits++; 13 14  } 15 double pi = 4.0 * numberOfHits / NUMBER_OF_TRIALS; 16 System.out.println("PI is " + pi); 17  } 18 19 }

 1 package chapter4;  2  3 public class MultiplicationTable {  4 public static void main(String[] args){  5 System.out.print(" Multiplication Table ");  6 System.out.print(" ");  7 for (int j = 1; j <= 9; j++)  8 System.out.print(" " + j );  9 10 System.out.println(" ---------------------------------------------"); 11 for (int i = 1; i <= 9; i++){ 12 System.out.print(i + " | "); 13 for (int j = 1; j <= 9; j++){ 14 System.out.printf("%4d", i * j); 15  } 16  System.out.println(); 17  } 18  } 19 }

 1 package chapter4;  2 //求素数(素数是指只能被1和它本身整除的数)；  3 public class PrimeNumber {  4 public static void main(String[] args){  5 final int NUMBER_OF_PRIMES = 50;  6 final int NUMBER_OF_PRIMES_PER_LINE= 10;  7 int count = 0;  8 int number = 2;  9 10 System.out.println("The first 50 prime numbers are "); 11 12 while (count < NUMBER_OF_PRIMES){ 13 boolean isPrime = true; 14 for(int divisor = 2; divisor <= number / 2; divisor++){ 15 if (number % divisor == 0){ 16 isPrime = false; 17 break; 18  } 19  } 20 if (isPrime) { 21 count++; 22 if (count % NUMBER_OF_PRIMES_PER_LINE == 0){ 23  System.out.println(number); 24  } 25 else 26 System.out.print(number + " "); 27  } 28 number++; 29  } 30  } 31 32 }

 1 package chapter4;  2  3 public class SentinelValue {  4 public static void main(String[] args){  5 java.util.Scanner input = new java.util.Scanner(System.in);  6 System.out.print("Enter an int value: ");  7 int data = input.nextInt();  8  9 int sum = 0; 10 while (data != 0){ 11 sum += data; 12 System.out.print("Enter an int value: "); 13 data = input.nextInt(); 14  } 15 System.out.println("The sum is " + sum); 16  } 17 18 19 }

 1 package chapter4;  2  3 public class SubtractionQuizLoop {  4 public static void main(String[] args){  5 java.util.Scanner input = new java.util.Scanner(System.in);  6  7 final int NUMBER_OF_QUESTIONS = 5;  8 int correctCount = 0;  9 int count = 0; 10 long startTime = System.currentTimeMillis(); 11 String output = ""; 12 13 while (count < NUMBER_OF_QUESTIONS){ 14 int num1 = (int)(Math.random() * 10); 15 int num2 = (int)(Math.random() * 10); 16 17 if (num1 < num2){ 18 int temp = num1; 19 num1 = num2; 20 num2 = temp; 21  } 22 23 System.out.print("What is " + num1 + " - " + num2 + " ? "); 24 int answer = input.nextInt(); 25 26 if (num1 - num2 == answer){ 27 System.out.println("You are correct!"); 28 correctCount++; 29  } 30 else 31 System.out.println("You answer is wrong. " + num1 + " - " + 32 num2 + " shoule be " + (num1 - num2)); 33 count++; 34 35 output += " " + num1 + "-" + num2 + "=" + answer + ((num1 - num2 == answer) ? " correct" : " wrong"); 36  } 37 long endTime = System.currentTimeMillis(); 38 long testTime = endTime - startTime; 39 System.out.println("Correct count is " + correctCount + 40 " Test time is " + testTime / 1000 + " second " + output); 41  } 42 }

 1 package chapter4;  2  3 public class TestBreak {  4 public static void main(String[] args){  5 int sum = 0;  6 int number = 0;  7 while (number < 20){  8 number++;  9 sum += number; 10 if (sum >= 100) break; 11  } 12 13 System.out.println("The numeber is " + number); 14 System.out.println("The sum is " + sum); 15 16  } 17 18 }

 1 package chapter4;  2  3 public class TestContinue {  4 public static void main(String[] args){  5 int sum = 0;  6 int number = 0;  7  8 while (number < 20){  9 number++; 10 if (number == 10 || number == 11) continue; 11 sum += number; 12  } 13 System.out.println("The sum is " + sum); 14  } 15 16 }

 1 package chapter4;  2  3 public class TestDoWhile {  4 public static void main(String[] args){  5 int data;  6 int sum = 0;  7 java.util.Scanner input = new java.util.Scanner(System.in);  8  9 do { 10 System.out.print("Enter an int value: "); 11 data = input.nextInt(); 12 sum += data; 13 }while(data != 0); 14 15 System.out.println("The sum is " + sum); 16 17  } 18 19 }

 1 package chapter4;  2  3 public class TestSum {  4 public static void main (String[] args){  5 float sum = 0;  6 for (float i = 0.01f; i <= 1.0f; i = i + 0.01f)  7 sum += i;  8 System.out.println("The sum is " + sum);  9  } 10 }

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