lesson4.java

public class MainClass {

	public static void main(String[] args) {
		
		//randomEx();
		
		//consequentialOddSum();
		
		//arry1DQ1();		
		//arry1DQ4();		
		
		arry2DQ2();		


		
	}


	private static void randomEx() {		
		for(int i = 0; i<10 ;i++){
			int rand = new Random().nextInt(27);
			System.out.println(rand);
		}
	}
	
	

	private static void consequentialOddSum() {
		
		
	
		int[]ary=new int[55];
		Random rnd=new Random();
		//init array data
		for(int i=0;i<ary.length;i++){
			ary[i]=rnd.nextInt(22);
			System.out.print(ary[i]+"\t");
		}
		
		System.out.println("\n");
		
		
		//loop over the array cells
		for (int i = 0; i < ary.length-1; i++) {
			if((ary[i]+ary[i+1])%2==1) System.out.printf(" %d:%d ",ary[i],ary[i+1]);	
		}

	}
	
	
	private static void arry1DQ1() {
		int[] arr = new int[]{29,
			80,
			19,
			29,
			17,
			8,
			12,
			15,
			23,
			55};
		
		/*for (int i = 0; i < arr.length / 2; i++){
			arr[i * 2] = i;
		}
		
		for (int i = 0; i < arr.length; i++){
			System.out.print(arr[i]+"\t");
		}
		
		
		System.out.println("\n");*/
		
		////////////////////////////////////////
		/*for (int i = 0; i < arr.length; i++){
			arr[i] = arr[arr.length - i];
		}
		
		for (int i = 0; i < arr.length; i++){
			System.out.print(arr[i]+"\t");
		}*/
		
		
		
		//////////////////////////////////////////
		/*
		for (int i = 0; i < arr.length - 1; i++){
			arr[i + 1] = arr[i];
		}
		for (int i = 0; i < arr.length; i++){
			System.out.print(arr[i]+"\t");
		}*/
		
		
	}
	
	
	private static void arry1DQ4() {
		int[] ary=new int[10];
		
		for (int i=0; i<ary.length; i++){
			ary[i] = i*i;
		}
		
		for (int i = 0; i < ary.length; i++){
			System.out.print(ary[i]+"\t");
		}
		
		
	}
	
	private static void arry2DQ2() {
		
		boolean[][] arryChairs = new boolean[30][50]; 
		
		for (int i = 0 ; i < arryChairs.length; i++ ){
			
			for(int j = 0; j < arryChairs[i].length; j++){
				arryChairs[i][j] = new Random().nextBoolean();
			}
			
		}
		
		
		/*for (int i = 0 ; i < arryChairs.length; i++ ){
			
			for(int j = 0; j < arryChairs[i].length; j++){
				System.out.print(arryChairs[i][j]+"\t");
			}
			
		}*/
		
		Scanner scanner = new Scanner(System.in);
		
		int i = 0;
		
		while(i < 40){
			System.out.printf("person number %d please enter seat row \n",i);
			
			int row =scanner.nextInt();
			
			System.out.printf("person number %d please enter column \n",i);
			
			int column =scanner.nextInt();
			
			if(!arryChairs[row][column]){
				arryChairs[row][column] = true;
				System.out.printf("person number %d have a nice show \n",i);	
				i++;
			}else{
				System.out.printf("person number %d the seat is taken \n",i);
			}
			
		}
		
		
	}

	

}