welcome.java

this a java example,it is concernging array instance,give some different type form

public class Welcome
{
	public static void main(String[] args)
	{
		//System.out.print("维新:http://www.mybole.com.cn\n");
		//System.out.println(" Welcome you!");
		/*byte b;
		b=3;
		b=(byte)(b*3);
		System.out.println(b);*/
		//short s;
		
		/*int i;
		long l;*/
		/*char ch;
		ch=97;
		System.out.println(ch);*/
		/*float f;
		f=1.3f;
		System.out.println(f);*/
		//double d;
		/*boolean bool;
		bool=true;
		System.out.println(bool);*/
		
		/*if(true)
		{
		}*/
		//int num[]=new int[3];
		/*int[] num;
		num={1,2,3};		//error*/
		//int [] num1;
		//int []num2;
		//num=new int[3];
		
		//int [] num=new int[]{1,2,3};	//ok
		//int [] num=new int[3]{1,2,3};	//error;
		/*int [] num;
		num=new int[3];
		num[0]=1;
		num[1]=12;
		num[2]=32;
		System.out.println(num[0]);
		System.out.println(num[1]);
		System.out.println(num[2]);*/
		
		/*int [][] num;
		num=new int[3][4];
		num[0][1]=12;
		num[2][3]=34;*/
		
		/*int [][] num;
		num=new int[3][];
		num[0]=new int[5];
		num[1]=new int[3];
		num[2]=new int[2];
		
		num[0][4]=45;
		num[1][2]=34;
		num[2][1]=21;
		System.out.println(num[0][4]);
		System.out.println(num[1][2]);
		System.out.println(num[2][1]);
		System.out.println(num[2][2]);*/
		
		//int [][] num=new int[][]{1,2,3,4,5,5};		//error
		//int [][] num=new int[][]{{1,2,3},{4,5,5}};	//ok
		//int [][] num=new int[2][]{{1,2,3},{4,5,5}};	//error
		//int [][] num={{1,2,3},{4,5,6}};		//ok
		
		/*int [][] num={{1,2,3},{4,5},{6}};
		System.out.println(num[0][2]);
		System.out.println(num[1][1]);
		System.out.println(num[2][0]);*/
		
		/*int i=3;
		//System.out.println(i++);
		System.out.println(++i);*/
		
		/*int i=3;
		//int count=(i++)+(i++)+(i++);
		int count=(++i)+(++i)+(++i);
		System.out.println(i);
		System.out.println(count);*/
		
		if()
		{
		}
		while(true)
		{
		}
		do
		{
		}while(true);
		
		for(int i=0;i<10;i++)
		{
		}
		
	}
}