变量，常量，字符，字符串，数组的声明及初始化

package test;

public class Main {

      public static void main(String args[])

      {

      byte a=4;

      int  b=5;

      short c=9;

      long d=7l;

      float e=5.5f;

      double f=6d;

      

      System.out.println("a="+a+"\t"+"b="+b+"\t"+"c="+c+"\t"+"d="+d+"\t"+"e="+e+"\t"+"f="+f+"\n");

      

      char g='g';

      int h=g;

      boolean i=true;

      System.out.println("g="+g+"\t"+"h="+h+"\t"+"i="+i+"\n");

     

      String s="GXM";

      int len=s.length();

      System.out.println(s+" GXM.length="+len);

      

      String[] str={"YI","BA","SHUA","ZI"};

      int k=0;

      for(k=0;k<str.length;k++)

    	  System.out.println("str["+k+"]="+str[k]+"\n");

      

      

      }

}

　　输出入下：

    a=4 b=5 c=9 d=7 e=5.5 f=6.0

    g=g h=103 i=true

   GXM GXM.length=3 str[0]=YI

   str[1]=BA

   str[2]=SHUA

   str[3]=ZI