https://docs.oracle.com/javase/jp/21/docs/api/java.base/java/util/function/IntToLongFunction.html
IntToLongFunction (Java SE 21 & JDK 21)
declaration: module: java.base, package: java.util.function, interface: IntToLongFunction
java sejdk
https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/IntToLongFunction
IntToLongFunction | J2ObjC | Google for Developers
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