【JavaSE】数组相关练习

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计算数组中最大值

//Java数组章节练习题
public class ArrayUtils{

    //1.计算数组中最大值
    public static int arrayMaxElement(int[] data){
		int i = 0;
		int max = data [0];
		for (i = 0;i < data.length;i++){
			if (data[i] >= max ){
				max = data [i];
			}
		}
        return max;
    }

计算数组中最小值

    //2.计算数组中最小值
    public static int arrayMinElement(int[] data){
		int i = 0;
		int min = data [0];
		for (i = 0;i < data.length;i++){
			if (data[i] <= min ){
				min = data [i];
			}
		}
        return min;
    }
    

计算数组值之和

  //3.计算数组值之和
  public static int arrayElementSum(int[] data){
      int i = 0;
  	int sum = 0;
  	for(i = 0;i<data.length;i++){
  		sum = sum + data[i];
  	}
      return sum;
  }

数组拼接

  //4.数组拼接
  public static int[] arrayJoin(int[] a, int[] b){
      int [] c = new int[a.length+b.length];
  	for(int i = 0;i<a.length;i++){
  		c[i] = a[i];
  	}
  	for (int i = a.length;i<c.length;i++){
  		c[i] = b[i-a.length];
  	}
      return c;
  }

数组截取

    //5.数组截取
    //[start, end)
    public static int[] arraySub(int[] data, int start , int end){
        int [] c = new int [end-start];
		for(int i = 0;i<end-start;i++){
			c[i] = data [i+start];
		}
        return c;
    }

数组打印

  //6.数组打印
  public static void printArray(int[] data){
  	for(int i = 0;i<data.length;i++){
  		System.out.print(data[i]);
  	}
  	System.out.println();
  }

数组反转

  //7.数组反转
  // 比如：[1,2,3,4] => [4,3,2,1]
  public static void printReversal(int[] data){
  	int [] c = new int[data.length];
  	for(int i=0;i<data.length;i++){
  		c[i] = data[(data.length)-i-1];
  	}
  	for(int i = 0;i<data.length;i++){
  		System.out.print(c[i]);
  	}		
  }

测试

  public static void main(String[] args){
  	int [] data  = new int [10];
  	data[0] = 2;
  	data[1] = 7;
  	data[2] = 4;
  	data[3] = 9;
  	data[4] = 0;
  	data[5] = 8;
  	data[6] = 5; 
  	data[7] = 1;
  	data[8] = 3;
  	data[9] = 6;
  	//System.out.println(arrayMaxElement(data));  
  	//System.out.println(arrayMinElement(data));
  	//System.out.println(arrayElementSum(data));
  	//printArray(data);
  	//printArray(arraySub(data,1,5));
  	printReversal(data);
  	/*
  	int[] a = new int[5];
  	int[] b = new int[3];
  	a[0] = 12;
  	a[1] = 13;
  	a[2] = 14;
  	a[3] = 15;
  	a[4] = 16;
  	b[0] = 0;
  	b[1] = 1;
  	b[2] = 2;
  	printArray(arrayJoin(a,b));*/
  }
}