Java数组与栈内存、堆内存

package ch4;

/**

 * Created by Jiqing on 2016/11/9.

 */

public class ArrayInRam {

    public static void main(String[] args) {

        int[] a = {5,7,20};

        int[] b = new int[4];

        System.out.println("b数组的长度为："+b.length);

        for(int i = 0,len = a.length;i<len;i++) {

            System.out.println(a[i]);

        }

        // 循环输出b数组的元素

        for (int i = 0,len = b.length;i<len;i++) {

            System.out.println(b[i]);

        }

        // b引用指向a引用的数组

        b = a;

        System.out.println("b数组的长度为："+b.length);

        for (int i = 0,len = b.length;i<len;i++) {

            System.out.println(b[i]);

        }

        a[1] = 11;

        System.out.println(b[1]); // 值变了

    }

}

package ch4;

/**

 * Created by Jiqing on 2016/11/9.

 */

public class Person {

    public int age; // 年龄

    public double height; // 身高

    public void info() {

        System.out.println("我的年龄是："+age+",我的身高是："+height);

    }

}

package ch4;

/**

 * Created by Jiqing on 2016/11/9.

 */

public class Student {

    public static void main(String[] args) {

        Person[] students;

        students = new Person[2];

        Person zhang = new Person();

        zhang.age = 15;

        zhang.height = 158;

        Person lee = new Person();

        lee.age = 16;

        lee.height = 161;

        students[0] = zhang;

        students[1] = lee;

        lee.info(); // 我的年龄是：16,我的身高是：161.0

        students[1].info(); // 我的年龄是：16,我的身高是：161.0

    }

}

巴特西

Java数组与栈内存、堆内存

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