数组，排序，查找

1. import java.util.Scanner;
   public class Array02{public static void main(String[] args) {// double a[] = new double[5];// System.out.println(a[0]);// System.out.println(a[2]);// System.out.println(a[3]);//循环输入5个成绩，保存到double数组，并输出。Scanner scanner = new Scanner(System.in);//动态初始化。double scores[]; //声明数组，这时scores是nullscores = new double[5]; //分配内存空间，可以存放数据//静态初始化//int a[] = {1,2,3,4,5,6,7};//double scores[] = new double[5];for(int i = 0;i < scores.length;i++){System.out.println("请输入第"+(i+1)+"个成绩。");double score = scanner.nextDouble();scores[i] = score;//scores[i] = scanner.nextDouble();}for(int j=0;j<5;j++){System.out.println("第"+(j+1)+"个成绩是"+scores[j]);}}
   }

public class Array06{public static void main(String[] args) {//基本数据类型赋值，赋值方式为值拷贝。//n2的变化，不会影响到n1的值。int n1 = 90;int n2 = n1;n2 = 80;System.out.println("n1="+n1);//90System.out.println("n2="+n2);//80//数组在默认情况下是引用传递，赋的值是地址，赋值方式为引用赋值，//是一个地址，int arr1[] = {1,2,3};int arr2[] = arr1;System.out.println("arr1的第一个元素："+arr1[0]);//1arr2[0] = 10;//System.out.println("arr1的第一个元素："+arr1[0]);//10,把arr1数组的值给改变了。}
}