EduCoder Java程序设计---Java语言基础（九）- 数组进阶

约定不等于承诺〃 2023-09-30 12:47 11阅读 0赞

**第1关 [数组的复制][Link 1]**

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 i = 0; i < arr2.length ; i++){
    			arr2[i] = arr1[i];
    		}	
    		
    		
    		//输出arr2
    		for(int i = 0 ; i < arr2.length ; i ++ ){
    			System.out.println(arr2[i]);
    		}
    		
    		
    		/********** End **********/
    	}
    }

**第2关 [数组中元素的查找][Link 2]**

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++){
    			if (str .equals(arr[i])){
    				System.out.print(str + "在数组的第" + (i+1) + "个位置");
    
    			}
    		}
    		
    		
    		/********** End **********/
    	}
    }

**第3关 [交换算法][Link 3]**

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 c;
    		c = b;
    		b = a;
    		a = c;
    	
    		/********** End **********/
    		System.out.println(a);
    		System.out.println(b);
    	}
    	
    }

**第4关 [选择排序][Link 4]**

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++){
    			for(int j = 0; j < arr.length-1 ;j++ ){
    				int temp ;
    				if(arr[j] < arr[j+1]){
    					temp = arr[j+1];
    					arr[j+1] = arr[j];
    					arr[j] = temp;
    				}
    			}
    		}
    		System.out.print(Arrays.toString(arr));
    		
    		
    		
    		
    		
    		
    		
    		/********** End **********/
    	}
    }

**第5关 [冒泡排序][Link 5]**

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-1 ; j++){
    				int temp ;
    				if(arr[j]>arr[j+1]){
    					temp = arr[j];
    					arr[j] = arr[j+1];
    					arr[j+1] = temp;
    				}
    			}
    		}
    		System.out.print(Arrays.toString(arr));
    		
    		
    		
    		/********** End **********/
    	}
    }

[Link 1]: https://www.educoder.net/tasks/f8ln9mvtcb4o
[Link 2]: https://www.educoder.net/tasks/fp4yukw35a7q
[Link 3]: https://www.educoder.net/tasks/3kfyzajc2or6
[Link 4]: https://www.educoder.net/tasks/wlf7gzjiycmo
[Link 5]: https://www.educoder.net/tasks/px7jr8wvoune