finalarguments.java

来自「翁剀JAVA语言那门课程的教案 很多人都看多他的视频教程可惜没有ppt的教案」· Java 代码 · 共 25 行

//: FinalArguments.java
// Using "final" with method arguments

class Gizmo {
	public void spin() {}
}

public class FinalArguments {
	void with(final Gizmo g) {
		//! g = new Gizmo();			//	Illegal -- g is final
		g.spin();
	}
	void without(Gizmo g) {
		g = new Gizmo();			
		g.spin();
	}
	//! void f(final int i) { ++i; }	//	Can't change
	//	You can only read from a final primitive
	int g(final int i) { return i+1; };
	public static void main(String[] args) {
		FinalArguments bf = new FinalArguments();
		bf.without(null);
		bf.with(null);
	}
}