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AboutConditionals.java
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155 lines (141 loc) · 3.05 KB
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package beginner;
import com.sandwich.koan.Koan;
import static com.sandwich.koan.constant.KoanConstants.__;
import static com.sandwich.util.Assert.assertEquals;
public class AboutConditionals {
@Koan
public void basicIfWithoutCurly(){
// Ifs without curly braces are ugly and not recommended but still valid:
int x = 1;
if (true)
x++;
assertEquals(x, __);
}
@Koan
public void basicIfElseWithoutCurly(){
// Ifs without curly braces are ugly and not recommended but still valid:
int x = 1;
boolean secretBoolean = false;
if (secretBoolean)
x++;
else
x--;
assertEquals(x, __);
}
@Koan
public void basicIfElseIfElseWithoutCurly(){
int x = 1;
boolean secretBoolean = false;
boolean otherBooleanCondition = true;
// Ifs without curly braces are ugly and not recommended but still valid:
if (secretBoolean)
x++;
else if (otherBooleanCondition)
x = 10;
else
x--;
assertEquals(x, __);
}
@Koan
public void nestedIfsWithoutCurlysAreReallyMisleading() {
// Why are these ugly you ask? Well, try for yourself
int x = 1;
boolean secretBoolean = false;
boolean otherBooleanCondition = true;
// Ifs without curly braces are ugly and not recommended but still valid:
if (secretBoolean) x++;
if (otherBooleanCondition) x = 10;
else x--;
// Where does this else belong to!?
assertEquals(x, __);
}
@Koan
public void ifAsIntended() {
boolean secretBoolean = true;
int x = 1;
if (secretBoolean) {
x++;
} else {
x = 0;
}
// There are different opinions on where the curly braces go...
// But as long as you put them here. You avoid problems as seen above.
assertEquals(x, __);
}
@Koan
public void basicSwitchStatement() {
int i = 1;
String result = "Basic ";
switch(i) {
case 1:
result += "One";
break;
case 2:
result += "Two";
break;
default:
result += "Nothing";
}
assertEquals(result, __);
}
@Koan
public void switchStatementFallThrough() {
int i = 1;
String result = "Basic ";
switch(i) {
case 1:
result += "One";
case 2:
result += "Two";
default:
result += "Nothing";
}
assertEquals(result, __);
}
@Koan
public void switchStatementCrazyFallThrough() {
int i = 5;
String result = "Basic ";
switch(i) {
case 1:
result += "One";
default:
result += "Nothing";
case 2:
result += "Two";
}
assertEquals(result, __);
}
@Koan
public void switchStatementConstants() {
int i = 5;
// What happens if you remove the 'final' modifier?
// What does this mean for case values?
final int caseOne = 1;
String result = "Basic ";
switch(i) {
case caseOne:
result += "One";
break;
default:
result += "Nothing";
}
assertEquals(result, __);
}
@Koan
public void switchStatementSwitchValues() {
// Try different (primitive) types for 'c'
// Which types do compile?
// Does boxing work?
byte c = 'a';
String result = "Basic ";
switch(c) {
case 'a':
result += "One";
break;
default:
result += "Nothing";
}
assertEquals(result, __);
}
}