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Import a package to a class is not recognizable in Android Studio

I have the following class called DeviceConsistencyCodeGenerator.java of the directory devices and a part of the package : package mylibsignal.devices; as shown in the picture : DeviceConsistencyCodeGenerator.java
I want to import this class (DevicesConsistencyCodeGenerator.java) in another class that is in another directory, which means not in the same package. The class where I want to import the package mylibsignal.devices is shown in the picture : SignalServiceCipher
The problem is when I try to import the package import mylibsignal.devices or import mylibsignal.devices.DeviceConsistencyCodeGenerator, it is not recognizable. Can someone help me fix this?

SQUARE cannot be resolved to a variable in Processing/Eclipse

I have a problem with the following code:
parent.strokeCap(SQUARE);
I tried importing these:
import processing.core.PApplet;
import processing.core.PGraphics;
import processing.core.PShape;
import processing.core.PConstants;
import processing.core.PShapeSVG;
import processing.core.PGraphicsJava2D;
import processing.core.PStyle;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Arrays;
But the problem persists. Do I have to make another import? I tried to find what value SQUARE represents but was unable to find any info about what it should contain.

note that you're not writing "Processing", you're writing Java, with all the regular Java formalisms and requirements, with some of your imports simply being the Processing API library. If you need a library constant, PConstants.SQUARE will get you there.

Import "imports" in eclipse - Java

I have several java files in a package and all of them have the same import blocks e.g :
package org.ezim.core;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
import org.ezim.core.Ezim;
import org.ezim.core.EzimDtxSemantics;
import org.ezim.core.EzimLogger;
import org.ezim.ui.EzimFileOut;
import org.ezim.ui.EzimMain;
It looks awful having the same batches of code in each file and i want to refactor it.
I was wondering if its possible to put all these imports in a single java file then use a single line in all the other java files to call them.
Its like the extend function for classes (for variables) , but i want one for the imports.
Thanks

No. That isn't possible. What is possible is not using imports at all, instead you can use fully qualified class names like
org.ezim.core.Ezim ezim = new org.ezim.core.Ezim(); // <-- not import needed.

You can always use * sign to import multiple classes from one package, but thus watch for name clashes.

eclipse: import (classname) cannot be resolved

I am new in using eclipse java using multiple .java files. My eclipse java project consist of one project file two package files, each with one .java class
My 2nd java class import the 1st java class/package, like so
VerifyLogin.java
package VerifyLogin;
import ArgumentCountException;
ArgumentCountException.java
// ...
The problem is VerifyLogin.java is getting an error
Import ArgumentCountException cannot be resolved
Or any reference I have to ArgumentCountException cannot be resolved to a type.

In java if you need to import a class then you need to use the full qualified name for that class, as the following:
import packageName.YourClass;
For Example, if your need to use Scanner class, then you need to import it as:
import java.util.Scanner;
But if the class was withing the same package, you don't need to import it.

When importing your class, it should be done as below:
//Current package name for the VerifyLogin Class (All package names should be lowercase by convention)
package packageforcurrentclass;
//Import statements: import thedependencyclasspackage.thedependencyclassname
import exceptionpackage.ArgumentCountException;
public class VerifyLogin
{
...
}

Getting Error for package name in netbeans

I am using one .java file and i have given a package name as com.onlinmebank but netbeans displaying error at this package declaration line as Incorrect Package.
Following is the package declaration code.
package com.onlinebank;
import java.sql.*;
import java.util.*;
public class BankCommons{
//All Code Here
}
Can Anybody tell me why i am getting this error

All Java keywords are lower-case!
So, this should work:
package com.onlinebank;
import java.sql.*;
import java.util.*;
public class BankCommons {
//All Code Here
}
And keep in mind, that the file BankCommons.java must be placed in the directory com/onlinebank.

In package, p should be small not Package(no captial P).
Also in public class p should be small. Similarily for Import also.
Important note all java keywords are in lower cases