studying java
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yesterday,I learn a little java knowledge.会了在电脑上显示HELLO 了。
public class welcome
{
public static void main(String[] args)//主函数
{
System.out.println("HELLO WORLD");//打印输出字符串
//byte的用法
byte b;
b=3;
b=(byte)(b*3);
System.out.prontln(b);
short s;
int i;
long l;
char ch;
ch='a';
System.out.println(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);
int num[]=new int[3];
int[] num={1,2,3};
int []num1;
int [] num2;
num=new int[3];
int [] num=new int[]{1,2,3};
int [] num;
num[0]=1;
num[1]=2;
num[2]=43;
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]=35;
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[0][2]);
System.out.println(num[2][2]);
int [][] num=new int[][]{1,2,3,4,5,6};//error
int [][] num=new int[][]{{1,2,3},{4,5,6}};//ok
int [][] num=new int[2][]{{1,2,3},{4,5,6}};//error
int [][] num={{1,2,3}{4,5,5}};//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);
}
}
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