switch (charTestVar) { case 'a': System.out.println("char a selected"); break; case 'b': System.out.println("char b selected"); break; case 'c': System.out.println("char c selected"); break; default: System.out.println("None selected"); break; } } void shortTestVar() { short shortTestVar = 32;
switch (shortTestVar) { case 16: System.out.println("short 16 selected"); break; case 32: System.out.println("short 32 selected"); break; case 64: System.out.println("short 64 selected"); break; default: System.out.println("None selected"); break; } }
void intTestVar() { int intTestVar = 64;
switch (intTestVar) { case 16: System.out.println("int 16 selected"); break; case 32: System.out.println("int 32 selected"); break; case 64: System.out.println("int 64 selected"); break; default: System.out.println("None selected"); break; } } void longTestVar() { long longTestVar = 128;
switch (longTestVar) { case 16: System.out.println("a selected"); break; case 32: System.out.println("b selected"); break; case 64: System.out.println("c selected"); break; default: System.out.println("None selected"); break; } } public static void main(String[] args) { SwitchTest mySwitchTest = new SwitchTest(); mySwitchTest.byteTestVar(); mySwitchTest.charTestVar(); mySwitchTest.shortTestVar(); mySwitchTest.intTestVar(); mySwitchTest.longTestVar(); } } // END然后把有关 longTestVar() 的部分注释起来再看看。 其他剩下的几个基本数据类型可以类似的测试。
String tbl=""; int i; i=Integer.parseInt(tp_type.substring(3,4)); switch (i) { case 1: tbl="诺基亚";break; case 2: tbl="摩托罗拉";break; case 3: tbl="三星"; break; case 4: tbl="爱立信"; break; case 5: tbl="阿尔卡特"; break; } out.println(tbl);
{
case "a":
//......;
break;
case "ab":
//......;
break;
case "abc":
//......;
break;
case default:
//......;
break;
}
注意:“required: int”,好了,应该不用我再说了吧!
(switch中的表达式是什么类型)
------------------------------------------------------------------------------class switchtest{
public static void main(String[] args) {
switch ("abc"){
case "a":
System.out.println("a selected");
break;
case "ab":
System.out.println("ab selected");
break;
case "abc":
System.out.println("abc selected");
break;
default:
}
}
}
---------- Compile ----------
switchtest.java:5: incompatible types
found : java.lang.String
required: int
switch ("abc"){
^
switchtest.java:6: incompatible types
found : java.lang.String
required: int
case "a":
^
switchtest.java:10: incompatible types
found : java.lang.String
required: int
case "ab":
^
switchtest.java:14: incompatible types
found : java.lang.String
required: int
case "abc":
^
4 errors
Output completed (10 sec consumed) - Normal Termination
// BEGIN
public class SwitchTest { void byteTestVar() {
byte byteTestVar = 16;
switch (byteTestVar) {
case 16:
System.out.println("byte 16 selected");
break;
case 32:
System.out.println("byte 32 selected");
break;
case 64:
System.out.println("byte 64 selected");
break;
default:
System.out.println("None selected");
break;
}
} void charTestVar() {
char charTestVar = 'b';
switch (charTestVar) {
case 'a':
System.out.println("char a selected");
break;
case 'b':
System.out.println("char b selected");
break;
case 'c':
System.out.println("char c selected");
break;
default:
System.out.println("None selected");
break;
}
} void shortTestVar() {
short shortTestVar = 32;
switch (shortTestVar) {
case 16:
System.out.println("short 16 selected");
break;
case 32:
System.out.println("short 32 selected");
break;
case 64:
System.out.println("short 64 selected");
break;
default:
System.out.println("None selected");
break;
}
}
void intTestVar() {
int intTestVar = 64;
switch (intTestVar) {
case 16:
System.out.println("int 16 selected");
break;
case 32:
System.out.println("int 32 selected");
break;
case 64:
System.out.println("int 64 selected");
break;
default:
System.out.println("None selected");
break;
}
} void longTestVar() {
long longTestVar = 128;
switch (longTestVar) {
case 16:
System.out.println("a selected");
break;
case 32:
System.out.println("b selected");
break;
case 64:
System.out.println("c selected");
break;
default:
System.out.println("None selected");
break;
}
} public static void main(String[] args) {
SwitchTest mySwitchTest = new SwitchTest();
mySwitchTest.byteTestVar();
mySwitchTest.charTestVar();
mySwitchTest.shortTestVar();
mySwitchTest.intTestVar();
mySwitchTest.longTestVar();
}
}
// END然后把有关 longTestVar() 的部分注释起来再看看。
其他剩下的几个基本数据类型可以类似的测试。
int i;
i=Integer.parseInt(tp_type.substring(3,4));
switch (i)
{
case 1: tbl="诺基亚";break;
case 2: tbl="摩托罗拉";break;
case 3: tbl="三星"; break;
case 4: tbl="爱立信"; break;
case 5: tbl="阿尔卡特"; break;
}
out.println(tbl);
由于char,byte,short可以转成int,所以也算可以。
其他类型就不可以了。
if(i.equalsIgnoreCase("a")){
System.out.println("a selected");return;
}
if(i.equalsIgnoreCase("ab")){
System.out.println("ab selected");return;
}
if(i.equalsIgnoreCase("abc")){
System.out.println("abc selected");return;
}
if(i.equalsIgnoreCase("abcd")){
System.out.println("abcd selected");return;
}
System.out.println("No selected!");return;}