switch可作用於char byte short int

switch可作用於char byte short int對應的包裝類

switch不可作用於long double float boolean，包括他們的包裝類

 
public class Test {
	public static void main(String[] args) {
		// switch可作用於char byte short int
		char season1 = 3;
		byte season2 = 3;
		short season3 = 3;
		int season4 = 3;
 

 
		// switch可作用於char byte short int對應的包裝類
		Character season11 = 3;
		Byte season22 = 3;
		Short season33 = 3;
		Integer season44 = 3;
 
		// 下面的基本型別的包裝類就不行了，還有double float的包裝類
		// Long season = 0;
 
		// switch不可作用於long double float boolean，包括他們的包裝類
		long season5 = 3;
		
		double season6 = 3;
		float season7 =
 
 3f;
		boolean season8 = false;
		//......
 
		String strSeason = "";
		switch (season1) {
		case 1:
			strSeason = "Spring";
			break;
		case 2:
			strSeason = "Summer";
			break;
		case 3:
			strSeason = "Fall";
			break;
		case 4:
			strSeason = "Winter";
			break;
		default:
			strSeason = "四季中沒有這個季節"
 
;
			break;
		}
		System.out.println("strSeason:" + strSeason);
	}
}

switch中可以是字串型別String

public class Test {
	public static void main(String[] args) {
		int season = 0;
		String strSeason = "Summer";
		switch (strSeason.toLowerCase()) {
		case "spring":
			season = 1;
			break;
		case "summer":
			season = 2;
			break;
		case "fall":
			season = 3;
			break;
		case "winter":
			season = 4;
			break;
		default:
			season = -1;// 沒找到對應的季節
			break;
		}
		System.out.println(strSeason + "-->" + season);
	}
}