public class Elvis {
public static final Elvis INSTANCE = new Elvis();
private Elvis() {}
}
public class Elvis {
private static final Elvis INSTANCE = new Elvis();
private Elvis() {}
public static Elvis getInstance() { return INSTANCE;}
}
public class A {
private A() {}
public static void methon() {}
}
public final class Math {
private Math() {}
public static final double E = 2.7182818284590452354;
public static final double PI = 3.14159265358979323846;
public static double sin(double a) {
return StrictMath.sin(a); // default impl. delegates to StrictMath
}
public static double cos(double a) {
return StrictMath.cos(a); // default impl. delegates to StrictMath
}
public static double tan(double a) {
return StrictMath.tan(a); // default impl. delegates to StrictMath
}
......
public static float scalb(float f, int scaleFactor) {
return sun.misc.FpUtils.scalb(f, scaleFactor);
}
}
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