每日学习java笔记20090301
Char 型char a = 'a'; char b = 'b'; char c = '诸'; char d = '葛'; System.out.println(a+"_"+b+"_"+c+"_"+d); 结果为：a_b_诸_葛 byte e = 123; short h = e; byte j = (byte)h; System.out.println(e+"_"+h+"_"+j); int g = 8<<2;( 位运算与乘2的n次方效果相同，通常在开发中很多情况下，用左移代替以2的n次方) System.out.println(g);结果为: 16 int i = 88>>32;//88 long l = 67<<64;//67 System.out.println(i); System.out.println(l); //abs() 绝对值 int i = Math.abs(50); //50 long l = Math.abs(-50L); //-50 float f = Math.abs(20.0f); //20.0 double d = Math.abs(34.55); //34.55int i = 2;switch(i){ case 1: System.out.println("这是1"); break; case 2: System.out.println("这是2"); break; default: System.out.println("没有找找到");}
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