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switch如何使用

switch(expression){
case value :
//Statements
break; //optional
case value :
//Statements
break; //optional
//You can have any number of case statements.
default : //Optional
//Statements
}

public class Test {

public static void main(String args[]){
//char grade = args[0].charAt(0);
char grade = 'B';

switch(grade)
{
case 'A' :
System.out.println("Excellent!");
break;
case 'B' :
case 'C' :
System.out.println("Well done");
break;
case 'D' :
System.out.println("You passed");
case 'F' :
System.out.println("Better try again");
break;
default :
System.out.println("Invalid grade");
}
System.out.println("Your grade is " + grade);
}
}

编译并运行上面使用各种命令行参数的程序。这将产生以下结果：

Java技术_Java千百问（0018）_switch如何使用

原文：http://blog.csdn.net/ooppookid/article/details/51042786