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