ADD file via upload

Java入门 - 数组进阶.txt

@@ -0,0 +1,141 @@
+1.数组的复制
+package step1;
+ 
+import java.util.Scanner;
+ 
+public class HelloWorld {
+	public static void main(String[] args) {
+		//动态构建arr1
+		int[] arr1 = new int[3];
+		Scanner sc = new Scanner(System.in);
+		for(int i = 0 ; i< arr1.length ; i++){
+			arr1[i] = sc.nextInt();
+		}
+		/********** Begin **********/
+		//创建数组arr2
+        int[] arr2 = new int[arr1.length];
+ 
+        //使用for循环将arr1的数据复制给arr2
+ 
+        for (int j = 0; j < arr1.length; j++) {
+            arr2[j] = arr1[j];
+        }
+ 
+        //输出arr2
+        for (int array : arr2)
+            System.out.println(array);
+		/********** End **********/
+	}
+}
+2.数组中元素的查找
+package step2;
+ 
+import java.util.Scanner;
+ 
+public class HelloWorld {
+	public static void main(String[] args) {
+		Scanner sc = new Scanner(System.in);
+		
+		//str为要查找的字符串
+		String str = sc.next();
+		
+		/********** Begin **********/
+		//创建数组   arr  给数组赋值 {"张三","张三丰","张无忌","王二麻子","张富贵"}
+		String[] arr = {"张三", "张三丰", "张无忌", "王二麻子", "张富贵"};
+ 
+        for (int i = 0; i < arr.length; i++) {
+            int j = i + 1;
+            if (str.equals(arr[i]))
+                System.out.println(str + "在数组的第" + j + "个位置");
+        }
+		
+		/********** End **********/
+	}
+}
+3.交换算法
+package step3;
+ 
+import java.util.Scanner;
+ 
+public class HelloWorld {
+ 
+	public static void main(String[] args) {
+		Scanner sc = new Scanner(System.in);
+		int a = sc.nextInt();
+		int b = sc.nextInt();
+		/********** Begin **********/
+		//将a的值赋给b   b的值赋给a
+		
+		int temp=a;
+        a=b;
+        b=temp;
+ 
+		/********** End **********/
+		System.out.println(a);
+		System.out.println(b);
+	}
+	
+}
+4.选择排序
+package step4;
+ 
+import java.util.Arrays;
+import java.util.Scanner;
+ 
+public class HelloWorld {
+	public static void main(String[] args) {
+		Scanner sc = new Scanner(System.in);
+		//动态创建数组
+		int[] arr = new int[sc.nextInt()];
+		for(int i = 0 ; i< arr.length ; i++){
+			arr[i] = sc.nextInt();
+		}
+		/********** Begin **********/
+		for (int i = 0; i < arr.length - 1; i++) {
+            int k = i;
+            for (int j = k + 1; j < arr.length; j++) {
+                if (arr[j] > arr[k]) {
+                    k = j;
+                }
+            }
+            if (i != k) {
+                int temp = arr[i];
+                arr[i] = arr[k];
+                arr[k] = temp;
+            }
+        }
+        System.out.println(Arrays.toString(arr));	
+		
+		/********** End **********/
+	}
+}
+5.冒泡排序
+package step5;
+ 
+import java.util.Arrays;
+import java.util.Scanner;
+ 
+public class HelloWorld {
+	
+	public static void main(String[] args) {
+		Scanner sc = new Scanner(System.in);
+		//动态创建数组
+		int[] arr = new int[sc.nextInt()];
+		for(int i = 0 ; i< arr.length ; i++){
+			arr[i] = sc.nextInt();
+		}
+		/********** Begin **********/
+	    for (int i = 0; i < arr.length - 1; i++) {
+            for (int j = 0; j < arr.length - i - 1; j++) {
+                if (arr[j] > arr[j + 1]) {
+                    int temp = arr[j];
+                    arr[j] = arr[j + 1];
+                    arr[j + 1] = temp;
+                }
+            }
+        }
+        System.out.println(Arrays.toString(arr));
+		
+		/********** End **********/
+	}
+}