package shenhui;
public class code11{
public static void main(String[] args){
double bookprice[]=new double [10];
double bookpricebak[]=bookprice;
//数组的赋值,只是将bookprice数组的内存地址给了bookpricebak,实际上只有一个数组实例
double copybookprice[]=new double[bookprice.length];
double halfbookprice[]=new double[bookprice.length];
System.out.print("(for循环输出)每本书的价格是");
for(int a=0;a<bookprice.length;a++){
//bookprice.length为数组bookprice的长度
//使用for循环给bookprice中每个元素赋值，也可以使用bookprice[0]=100;这样给每个元素赋值
//或者int bookprice[]={100,101,102……};数组长度由{}个数决定
bookprice[a]=100+a;
//注意此处的a是索引值，索引从0开始
System.out.print(bookprice[a]+" ");
//在for循环中打印出每个元素
}
System.out.println();
System.out.print("(for-each输出)每本书的价格是");
for(double price:bookprice){
//使用for-each取出数组中的每个元素，for-each不需要像传统for循环般设定初始值、条件式和变量
//for-each循环会自动将数组中元素由第一个依次取到最后一个
//此处的price代表的是元素值
System.out.print(price+" ");
}
System.out.println();
System.out.print("bookpricebak数组内容：");
for(double i:bookpricebak){
System.out.print(i+" ");
}
System.out.println();
System.arraycopy(bookprice,0,copybookprice,0,bookprice.length/2);
//用arraycopy方法完成数组的复制，bookprice与copybookprice有单独的内存地址
System.out.print("copybookprice数组内容");
for(double i:copybookprice){
System.out.print(i+" ");
}
System.out.println();
System.out.print("将bookprice打半价");
for(int i=0;i<bookprice.length;i++){
halfbookprice[i]=bookprice[i]*0.5;
System.out.print(halfbookprice[i]+" ");
}
}
}
输出结果：
(for循环输出)每本书的价格是100.0 101.0 102.0 103.0 104.0 105.0 106.0 107.0 108.0 109.0
(for-each输出)每本书的价格是100.0 101.0 102.0 103.0 104.0 105.0 106.0 107.0 108.0 109.0
bookpricebak数组内容：100.0 101.0 102.0 103.0 104.0 105.0 106.0 107.0 108.0 109.0
copybookprice数组内容100.0 101.0 102.0 103.0 104.0 0.0 0.0 0.0 0.0 0.0
将bookprice打半价50.0 50.5 51.0 51.5 52.0 52.5 53.0 53.5 54.0 54.5