20151010上午课堂内容

        //字符串
        
        String str = "a";
        
         char c = 'd';
        
         int j = 0;
         
         String strl = new String("a bc bc a bc");
         
         char[] cc = {'a','b'};
         
         String str2 = new String(cc);
         
         System.out.println("str2 = " + str2);
         
         //连接字符串
         
         System.out.println("strl + str2 + j = " + strl + str2 + (j + 300));
         
         //99乘法表
         
         int[] a = new int[5];
         
         int l = a.length;//是属性
         
         int g = strl.length();//是方法
         
         System.out.println("strl.length() = " + g);
                      
         //查找
         int sy = strl.indexOf("bc");
         
         System.out.println("strl.indexOf(\"bc\") = " + sy);
         
         int syl = strl.lastIndexOf("bc");
         System.out.println("strl.lastIndexOf(\"\") = " + syl);
                 
                 //取出字符
                 System.out.println("charAt = " + strl.charAt(2));
         
         //取出字符串
         System.out.println("substring = " + strl.substring(3));
         
         System.out.println("substring = " + strl.substring(3,5));