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Anonymous classes in Java are analogous to lambda-expressions in Scheme. The purpose of this lab is to practice writing such classes. We will use the Intermediate Full Java language level for this lab.
Lambda-expressions in Java
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| Code Block |
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int x_minus_y(int x, final int y) {
return (Integer)new Lambda() {
Object apply(Object arg) {
return (Integer)arg - y;}
}.apply(x);
}
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What does this anonymous inner class do?
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Lambda whatIsIt() {
return new Lambda() {
Object apply(Object s1) {
return new Lambda() {
Object apply(Object s2) {
return new Lambda() {
Object apply(Object s3) {
return s1 + " " + s2 + " " + s3;
}
};
}
};
}
};
}
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Actually the above does not compile in the Intermediate language level. In full Java syntax, the code would like the following (and would compile):
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public class Currying {
Lambda whatIsIt() {
return new Lambda() {
public Object apply(final Object s1) {
return new Lambda() {
public Object apply(final Object s2) {
return new Lambda() {
public Object apply(final Object s3) {
return s1 + " " + s2 + " " + s3;
}
};
}
};
}
};
}
}
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