switch 语法

package test;

public class SwitchTest {

	/**
	 * @author yj
	 * 1,switch不能用string
	 * 2,switch中全部提升为 Integer 了
	 */
	public static void main(String[] args) {
		switch('a'){//switch("asdf"){
		case 'a'://case "a":
			System.out.println("switch can't be string");
		}
		
		final byte a1 = 8;
		final char a2 = 8;
		final short a3 = 8;
		final int a4 = 8;
		
		byte b1 = 8;
		switch(b1){
		//以下会编译出错，duplicate case!
		case a1:
			System.out.println("byte");break;
		case a2:
			System.out.println("char");break;
		case a3:
			System.out.println("short");break;
		case a4:
			System.out.println("int");break;
		default:
			System.out.println("default");
		}
	}

}