java 值传递机制

Posted 2022-07-04 DQ_CODING

说明

案例1

案例2

案例3

案例4

案例5

案例6

package lesson.l11_oop2;

/**
 * Illustration
 *
 * @author DengQing
 * @version 1.0
 * @datetime 2022/7/2 21:24
 * @function 将对象作为参数传递给方法
 */
public class Circle 
    double radius;

    public double findArea() 
        return Math.PI * Math.pow(radius, 2);
    



class PassObject 
    public void printAreas(Circle c, int time) 
        System.out.println("Radius\\t\\tArea");
        for (int i = 1; i <= time; i++) 
            c.radius = i;
            System.out.println(c.radius + "\\t\\t" + c.findArea());
        
        c.radius = time + 1;
    

    public static void main(String[] args) 
        PassObject passObject = new PassObject();
        Circle c = new Circle();
        passObject.printAreas(c, 5);
        System.out.println("now radius is " + c.radius);
    

代码

package lesson.l10_oop;

import java.util.Arrays;

/**
 * Illustration
 *
 * @author DengQing
 * @version 1.0
 * @datetime 2022/7/1 17:44
 * @function 值传递机制
 */
public class ValueTransfer 
    public static void main(String[] args) 
        int[] arr = new int[]1, 6, -3, 0, 10, 3, 5;
        ValueTransfer valueTransfer = new ValueTransfer();
        valueTransfer.print(arr);
        valueTransfer.bubbleSort(arr);
        valueTransfer.print(arr);
    

    /**
     * @return void
     * @Author DengQing
     * @Date 2022/7/1 17:47
     * @Param [arr]
     * @Function 数组的冒泡排序
     */
    public void bubbleSort(int[] arr) 
        for (int i = 0; i < arr.length - 1; i++) 
            for (int j = 0; j < arr.length - 1 - i; j++) 
                if (arr[j] > arr[j + 1]) 
                    swap(arr, j, j + 1);
                
            
        
    

    /**
     * @return void
     * @Author DengQing
     * @Date 2022/7/1 17:47
     * @Param [arr, i, j]
     * @Function 交换数组的两个数
     */
    public void swap(int[] arr, int i, int j) 
        int temp = arr[j];
        arr[j] = arr[i];
        arr[i] = temp;
    

    /**
     * @return void
     * @Author DengQing
     * @Date 2022/7/1 17:48
     * @Param [arr]
     * @Function 打印数组
     */
    public void print(int[] arr) 
        System.out.println(Arrays.toString(arr));