【java】第10章面向对象思考测试题（作业部分）

爱被打了一巴掌 2022-10-21 14:53 178阅读 0赞

### 文章目录 ###

*   *  10.3
     *  10.5
     *  10.10
     *  10.13
     *  10.18
     *  10.19
     *  10.25

## 10.3 ##

![在这里插入图片描述][20210505160821125.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70]

package wwr;
    //10.3  未完QAQ
    import java.util.Scanner;
    class MyInteger {
        
    	//0、一个名为value的int型数据域，存储这个对象表示的int值
    	private int value;
    	//1、一个为指定的int值创建MyInteger对象的构造方法
    	MyInteger(int Value) {
        
    		this.value = Value;
    	}
    	//2、一个返回int值的get方法
    	public int getValue() {
        
    		return value;
    	}
    	//3、如果值分别为偶数、奇数或素数，那么isEven()、is0dd()和isPrime()方法都会返回true
    	public boolean isEven() {
        
    		return isEven(value);
    	}
    	public boolean isOdd() {
        
    		return isOdd(value);
    	}
    	public boolean isPrime() {
        
    		return isPrime(value);
    	}
    	//4、如果指定值分别为偶数、奇数或素数，那么相应的静态方法isEven(int)、isOdd(int)和isPrime(int)会返回true
    	public static boolean isEven(int value) {
        	//偶
    		if(value % 2 == 0)
    			return true;
    		else
    			return false;
    	}
    	public static boolean isOdd(int value) {
        	//奇
    		if(value % 2 != 0)
    			return true;
    		else
    			return false;
    	}
    	public static boolean isPrime(int value) {
        	//素
    		for(int i = 2; i < value - 1; i++)
    			if(value % i == 0)
    				return false;
    		return true;
    	}
    	//5、如果指定值分别为偶数、奇数或素数，那么相应的静态方法isEven(MyInteger)、is0dd(MyInteger)和isPrime(MyInteger)会返回true
    	public static boolean isEven(MyInteger m) {
        	//偶
    		if(m.getValue() % 2 == 0)
    			return true;
    		else
    			return false;
    	}
    	public static boolean isOdd(MyInteger m) {
        	//奇
    		if(m.getValue() % 2 != 0)
    			return true;
    		else
    			return false;
    	}
    	public static boolean isPrime(MyInteger m) {
        	//素
    		for(int i = 2; i < m.getValue() - 1; i++)
    			if(m.getValue() % i == 0)
    				return false;
    		return true;
    	}
    	//6、如果该对象的值与指定的值相等，那么equals(int)和 equals(MyInteger)方法返回true
    	public boolean equals(int value) {
        
    		if(this.value == value)
    			return true;
    		else
    			return false;
    	}
    	public boolean equals(MyInteger m) {
        
    		if(this.value == m.getValue())
    			return true;
    		else
    			return false;
    	}
    	//7、静态方法parseInt(char[])将数字字符构成的数组转换为一个int值
    	public static int parseInt(char[] c) {
        
    		int tmp = 1, num = 0;
    		for(int i = c.length; i >= 0; i--) {
        
    			num += c[i] * tmp;
    			tmp *= 10; 
    		}
    		return num;
    	}
    	//8、静态方法parseInt(String)将一个字符串转换为一个int值
    	public static int parseInt(String s) {
        
    		int tmp = 1, num = 0;
    		for(int i = s.length(); i >= 0; i--) {
        
    			num += s.charAt(i) * tmp;
    			tmp *= 10; 
    		}
    		return num;
    	}
    	
    }
    public class Demo {
        
    	
        public static void main(String[] args) {
        
            
        	Scanner input = new Scanner(System.in);
        	System.out.print("Enter n1: ");
        	int n1 = input.nextInt();
        	//1、一个为指定的int值创建MyInteger对象的构造方法
        	MyInteger N1 = new MyInteger(n1);
        	//2、一个返回int值的get方法
        	System.out.println("n1 is " + N1.getValue()); 
        	//3、如果值分别为偶数、奇数或素数，那么isEven()、is0dd()和isPrime()方法都会返回true
    		System.out.println("Is n1 an even number?" + '\t' + N1.isEven());
    		System.out.println("Is n1 an odd number?" + '\t' + N1.isOdd());
    		System.out.println("Is n1 a prime?" + '\t' + N1.isPrime());
    		//4、如果指定值分别为偶数、奇数或素数，那么相应的静态方法isEven(int)、isOdd(int)和isPrime(int)会返回true
    		System.out.println("Is n1 an even number?" + '\t' + MyInteger.isEven(n1));
    		System.out.println("Is n1 an odd number?" + '\t' + MyInteger.isOdd(n1));
    		System.out.println("Is n1 a prime?" + '\t' + MyInteger.isPrime(n1));
    		//5、如果指定值分别为偶数、奇数或素数，那么相应的静态方法isEven(MyInteger)、is0dd(MyInteger)和isPrime(MyInteger)会返回true
    		System.out.println("Is n1 an even number?" + '\t' + MyInteger.isEven(N1));
    		System.out.println("Is n1 an odd number?" + '\t' + MyInteger.isOdd(N1));
    		System.out.println("Is n1 a prime?" + '\t' + MyInteger.isPrime(N1));
    		
    		System.out.print("Enter n2: ");
    		int n2 = input.nextInt();
    		MyInteger N2 = new MyInteger(n2);
    		//6、如果该对象的值与指定的值相等，那么equals(int)和 equals(MyInteger)方法返回true
    		System.out.println("Is n1 equal to n2?" + '\t' + N1.equals(n2));
    		System.out.println("Is n1 equal to n2?" + '\t' + N1.equals(N2));
    		
        }
    }

## 10.5 ##

![在这里插入图片描述][20210505160855590.png]

package wwr;
    //10.5
    import java.util.Scanner;
    import java.util.Arrays;
    class StackOfIntegers {
        
    	
        private int integer;
        public StackOfIntegers(int integer) {
        
            this.integer = integer;
        }
    
        private static int k = 0;
        private static int l = 0;
    
        public int[] GetPrime() {
        
            int[] getPrime = new int[this.integer];
            boolean isPrime = true;
            for (int i = 2; i < this.integer; i++) {
        
                for (int h = 2; h < i; h++) {
        
                    if (i % h == 0) {
        
                        isPrime = false;
                        break;
                    }
                }
                if (isPrime) {
        
                    getPrime[k] = i;
                    k++;
                } else isPrime = true;
            }
            return getPrime;
        }
    
        public int[] Prime() {
        
            int[] get = GetPrime();
            int[] prime1 = new int[k];
            boolean judge = false;
            while (this.integer != 0) {
        
                for (int a = k - 1; a >= 0; a--) {
        
                    if ((int) (this.integer / get[a]) == (double) this.integer / get[a]) {
        
                        prime1[l] = get[a];
                        this.integer /= get[a];
                        l++;
                    }
                    if (integer == get[a] || integer == 1) {
        
                        prime1[l] = get[a];
                        judge = true;
                        break;
                    }
                }
                if (judge)
                    break;
            }
            int[] prime = new int[l + 1];
            for (int i = 0; i < l + 1; i++){
        
                prime[i] = prime1[i];
            }
            return prime;
        }
    }
    
    public class Demo {
        
    
    	public static void main(String[] args) {
        
    		System.out.print("Please input a integer: ");
            Scanner input = new Scanner(System.in);
            int integer=input.nextInt();
            StackOfIntegers stackOfIntegers = new StackOfIntegers(integer);
            int[] a=stackOfIntegers.Prime();
            System.out.print("All the prime factors of the "+ integer + " are :");
            System.out.print(Arrays.toString(a));
            input.close();
    
    	}
    
    }

## 10.10 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70 1]

package wwr;
    //10.10 参考https://www.nowcoder.com/questionTerminal/8a35140dd85a4cfeb954964d5ea98437
    import javax.management.RuntimeErrorException;
    
    class Queue{
        
    	
        private int[] element;
        public static final int capacity = 8;
        private int size = 0;
        public Queue() {
        
            element = new int[capacity];
        }
        public void enqueue(int v) {
        
            if(size >= element.length) {
        
                int[] temp = new int[element.length * 2];
                System.arraycopy(element, 0, temp, 0, element.length);
                element = temp;
            }
            element[size++] = v;
        }
        public int dequeue() {
        
            if (empty()) {
        
                throw new RuntimeException("error");
            } 
            else {
        
                int temp = element[0];
                for (int i = 0; i < element.length - 1; i++) {
        
                    element[i] = element[i + 1];
                }
                size--;
                return temp;
            }
        }
        public boolean empty() {
        
            return size == 0;
        }
        public int getSize() {
        
            return size;
        }
        
    }
    
    public class Demo {
        
    	
        public static void main(String[] args) {
        
            Queue queue = new Queue();
            for (int i = 1; i <= 20; i++) {
        
                queue.enqueue(i);
            }
            System.out.println("队列实际长度：" + queue.getSize());
            for (int i = 0; i < 20; i++) {
        
                System.out.println("元素 "+ queue.dequeue() + "出队列");
            }
        }
    
    }

## 10.13 ##

![在这里插入图片描述][20210505160934733.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70 2]

package wwr;
    //10.13 参考https://blog.csdn.net/IFHHH/article/details/105581205
    import java.util.*;
    class MyRectangle2D {
        
    
        public MyRectangle2D() {
        
            this.x = 0;
            this.y = 0;
            this.height = 1;
            this.width = 1;
        }
    
        private double x;
        private double y;
        private double width;
    
        public double getX() {
        
            return x;
        }
        public void setX(double x) {
        
            this.x = x;
        }
        public double getY() {
        
            return y;
        }
        public void setY(double y) {
        
            this.y = y;
        }
        public double getWidth() {
        
            return width;
        }
        public void setWidth(double width) {
        
            this.width = width;
        }
        public double getHeight() {
        
            return height;
        }
        public void setHeight(double height) {
        
            this.height = height;
        }
        private double height;
        public MyRectangle2D(double x, double y, double width, double height) {
        
            this.x = x;
            this.y = y;
            this.width = width;
            this.height = height;
        }
        public double getArea() {
        
            return height * width;
        }
        public double getPerimeter() {
        
            return (height + width) * 2;
        }
        public boolean contains(double x, double y) {
        
        	//长方形判断：点到中心点距离x < width / 2 并且 y < height / 2
            return Math.abs(x - this.x) < width / 2 && Math.abs(y - this.y) < height / 2;
        }
        public boolean contains(MyRectangle2D r) {
        
            //包含判断：俩中心点距离小于宽距离和高距离；
            return Math.abs(this.x - r.getX()) <= Math.abs((this.width - r.width) / 2)
            		&& Math.abs(this.y - r.y ) <= Math.abs((this.height - r.height) / 2);
        }
        public boolean overLaps(MyRectangle2D r) {
        
            //重叠判断：点距离大于宽之差，高之差，小于宽高之和
            boolean overlaps1 = Math.abs(this.x - r.getX()) > Math.abs((this.width - r.width) / 2) 
            		&& Math.abs(this.y - r.y )> Math.abs((this.height - r.height) / 2);
            boolean overlaps2 = Math.abs(this.x - r.getX()) < Math.abs((this.width + r.width) / 2) 
            		&& Math.abs(this.y - r.y )< Math.abs((this.height + r.height) / 2);
            return overlaps1 && overlaps2;
        }
    
    }
    
    public class Demo {
        
    	
        public static void main(String[] args) {
        
        	MyRectangle2D r1 = new MyRectangle2D(2, 2, 5.5, 4.9);
            System.out.println("The r1's area is " + r1.getArea());
            System.out.println("The r1's perimeter is " + r1.getPerimeter());
            System.out.println("The point contain is " + r1.contains(3, 3));
            System.out.println("The new myRectangle contain is " + r1.contains(new MyRectangle2D(4, 5, 10.5, 3.2)));
            System.out.println("The new myRectangle overLaps is " + r1.overLaps(new MyRectangle2D(3, 5, 2.3, 5.4)));
        }
    
    }

## 10.18 ##

![在这里插入图片描述][20210505161028493.png]

package wwr;
    //10.18 参考https://blog.csdn.net/weixin_34600909/article/details/114863569
    import java.math.BigInteger;
    public class Demo {
        
    	public static void main(String[] args) {
        
    		long startTime = System.currentTimeMillis();
    		BigInteger bigNum = new BigInteger(Long.MAX_VALUE + "");
    		bigNum = bigNum.add(BigInteger.ONE);
    		int count = 1;
    		while (count <= 5) {
        
    			if (isPrime(bigNum)) {
        
    				System.out.println(bigNum);
    				count++;
    			}
    			bigNum = bigNum.add(BigInteger.ONE);
    		}
    		System.out.println(bigNum.toString());
    //		long endTime = System.currentTimeMillis();
    //		System.out.println("Time spent is " + (endTime - startTime) + " milliseconds");
    	}
    	public static boolean isPrime(BigInteger num) {
        
    		return true;
    	}
    }

## 10.19 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70 3]

package wwr;
    //10.19  参考https://blog.csdn.net/lyf3010572059/article/details/89440158?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-3.vipsorttest&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromMachineLearnPai2%7Edefault-3.vipsorttest
    import java.math.BigInteger;
    public class Demo {
        
    	
    	public static void Check(BigInteger result, int i) {
        
    		if(result.isProbablePrime(1))
    			System.out.println(i + "\t" + result);
    	}
    	
    	public static void main(String[] args) {
        
    		BigInteger num1 = BigInteger.ONE;
    		System.out.println("p\t2^p-1");
    		System.out.println("");
    		for(int i = 0; i <= 100;i++) {
        
    			num1 = num1.multiply(new BigInteger("2"));
    			BigInteger result = num1.subtract(new BigInteger("1"));
    			Check(result, i);
    		}
    	}
    	
     
    }

## 10.25 ##

![在这里插入图片描述][20210505161134707.png]

package wwr;
    //10.25 参考http://cache.baiducontent.com/c?m=CFVc7eamI2vqo9axvdxAsvYP5lalUczMQyUHu7f2REIhE28hhgkjoxBE-3l-UDVnbHXIkp4S4W3bag9N3AUJdEcL2m7G26drodbKBSZs0ao72eZz7iqYVPhufgWEn9-omLVXdiOb5iIHlt_HciAkX7HVyx736w1TH5lGKVN3KLC_SqYlJdW81wSTX9ME2UAjZ6fD3u_B8El6-H8RMAY3dpy0WyY5bnZRwnqUfsqn31Vk7YavEPZh8l57DxbRO5UlL3XmmvPf33hnaTexxFfml4cBa-XFItAKT4SINLmrYPnRBerdvRL00YyTmhUSVbC3iBJlPh0ushUpyiz14sZgP-7ZNvFjMwzV342hIly-zNu&p=8c74d63785cc43b508e294754e4e&newp=93769a47c88108f108e294755f5d92695d0fc20e3addd501298ffe0cc4241a1a1a3aecbf2c251b07d0c3766c00a54c56ebf436703d0034f1f689df08d2ecce7e31ca6e6a&s=9517fd0bf8faa655&user=baidu&fm=sc&query=string%C0%E0%D6%D0%B5%C4split%B7%BD%B7%A8%BB%E1%B7%B5%BB%D8%D2%BB%B8%F6%D7%D6%B7%FB%B4%AE%CA%FD%D7%E9%2C%B8%C3%CA%FD%D7%E9%CA%C7%D3%C9&qid=d847a699001948b5&p1=3
    import java.util.Scanner;
    import java.util.ArrayList;
    import java.util.regex.*;
    public class Demo {
        
    
        public static String[] split(String s, String regex) {
        
            ArrayList<String> matchList = new ArrayList<String>();
            Pattern pat = Pattern.compile(regex);  
            Matcher mat = pat.matcher(s);
            int index = 0;
            while(mat.find()) {
        
                    String match = s.subSequence(index, mat.start()).toString();
                    matchList.add(match);
                    String match2 = s.subSequence(mat.start(),mat.end()).toString();
                    matchList.add(match2);
                    index = mat.end();
            }
            String match = s.subSequence(index,s.length()).toString();
            matchList.add(match);
            
            int resultSize = matchList.size();
            while (resultSize > 0 && matchList.get(resultSize-1).equals(""))
                resultSize--;
            String[] result = new String[resultSize];
            return matchList.subList(0, resultSize).toArray(result);
            }
        public static void main(String[] args) {
        
            String[] ans=split("ab#123#453","#");
            System.out.println("ab#123#453");
            for(int i=0;i<ans.length;i++) {
        
                System.out.println(ans[i]);
            }
            String[] ans2=split("a?b?gf#e","[?#]");
            System.out.println("a?b?gf#e");
            for(int i=0;i<ans2.length;i++) {
        
                System.out.println(ans2[i]);
            }
        }
        
    }

[20210505160821125.png]: /images/20221021/33c55cbd4670421aa58463b75b6845e5.png
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[20210505160855590.png]: /images/20221021/86a267ba11de442897b383d2a7071551.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70 1]: /images/20221021/ecd16a3a8d36477f8cff0303b35d36b5.png
[20210505160934733.png]: /images/20221021/e806de2e699748f4930966203548ec11.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70 2]: /images/20221021/18c67b9323e54b49ab63fc758ce340ed.png
[20210505161028493.png]: /images/20221021/41184bf1c50d4dbcb1c2fc2699456385.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQ1ODc4Mjky_size_16_color_FFFFFF_t_70 3]: /images/20221021/ea1fd9e2711549c790bb72b8676cd199.png
[20210505161134707.png]: /images/20221021/6454dc7dcbd946168b2a91e679d31f70.png