Java Hashtable Implementation: Methods and Usage
Java Hashtable Implementation Details
toString Method
The toString method returns a string representation of the hashtable’s contents:
public String toString() {
StringBuffer sb = new StringBuffer();
Entry1 tab[] = table;
for (int i = 0; i < tab.length; i++) {
for (Entry1 e = tab[i]; e != null; e = e.getNext()) {
sb.append(e + " ");
}
}
return sb.toString();
}
Mayor Method
The Mayor method finds the largest key (assuming keys are integers) in the hashtable:
Microcontroller Architecture and Communication Protocols
Microcontroller Architecture
MCU Components: CPU, RAM, Flash, Bus, Peripherals, Pin Mux, Interrupts, Clocks.
Peripheral Examples
Timers, GPIO, UART, I2C, SPI, ADC, DAC, DMA.
I/O Types and Mechanisms
- Programmed I/O:
- CPU polls the device continuously in a loop, checking for readiness.
- Wastes CPU cycles, useful for simple, non-time-critical applications.
- Interrupt-driven I/O:
- Device sends an interrupt signal to the CPU when it’s ready.
- CPU can perform other tasks while waiting.
- Direct Memory Access (DMA):
- DMA
Mastering Dynamic Divs and Image Sliders in HTML
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Computer Networks: Types, Models, and Devices
Computer Networks
Computer networks enable the sharing of resources, facilitate communication, and support various applications such as:
- Email: Instant messaging and communication.
- Web Services: Access to websites and online services.
- File Sharing: Collaborative work and data storage.
- Streaming Services: Multimedia distribution.
Based on Topologies:
- Bus: Single central cable; simple and cost-effective.
- Star: Central hub; easy to manage and expand.
- Ring: Each device connected to two others; data travels in
Telecommunications Cables and Network Technologies
Telecommunication Cables and Network Technologies
Types of Cables
- Dual Pair Parallel Cable: Consists of two parallel cables, often rigid, isolated by a plastic such as polyethylene. It is used to connect the cable modem, telephone, or rosette.
- Inconvenience: Susceptible to noise and electromagnetic interference, as the part that carries the signal can act like an antenna.
- Twisted Pair Cable: Minimizes electromagnetic interference. The two wires are twisted, canceling out the effects of sending and receiving
Java Programming Exercises: Salary, Shapes, and More
Java Programming Exercises
Worker Salary Calculation
Calculate weekly salary based on hours worked.
import java.util.*;
public class Main {
public double calcularSalarioSemanal(int numHoras) {
double resultado;
if (numHoras <= 30) {
resultado = numHoras * 10;
} else {
resultado = (30 * 10) + ((numHoras - 30) * 15);
}
return resultado;
}
public void run() {
Scanner in = new Scanner(System.in);
int horas;