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Duvida
package atividadesn1;
import java.util.Scanner;
public class atividade28 {
public static void main(String[] args) {
Scanner entrada = new Scanner (System.in);
double numero1, numero2;
Object opcao = null;
System.out.print("Operações Permitidas\n Opções:\n 1 - Soma\n 2 - Subtração\n 3 - Multiplicação\n 4 - Divisão\n");
System.out.print("Digite uma opção: ");
if (("1".equals(opcao)) && (opcao.equals("2"))) && (opcao.equals("3"))) && (opcao.equals("4")))
{
System.out.print("Digite um número real......: ");
numero1 = entrada.nextDouble();
System.out.print("Digite um outro número real: ");
numero2 = entrada.nextDouble();
switch ("opcao") {
case "1": {
System.out.printf("SOMA: (%.2f) + (%.2f) = %.2f\n", numero1, numero2, numero1 + numero2);
break;
}
case "2": {
System.out.printf("SUBTRAÇÃO: (%.2f) - (%.2f) = %.2f\n", numero1, numero2, numero1 - numero2);
break;
}
case "3": {
System.out.printf("MULTIPLICAÇÃO: (%.2f) * (%.2f) = %.2f\n", numero1, numero2, numero1 * numero2);
break;
}
case "4": {
if (numero2 == 0.0) {
System.out.printf("DIVISÃO imposs\u00edvel: (%.2f) / (%.2f)\n", numero1, numero2);
break;
}
System.out.printf("Divisão: (%.2f) / (%.2f) = %.2f\n", numero1, numero2, numero1 / numero2);
}
}
}
else
{
System.out.printf("'%s' não é uma opção!\n", new Object[] { opcao });
}
}
}
Horas
package Bolo_no_Pote;
public class NewClass {
public static void main(String[] args) {
long totalmilisegundos = System.currentTimeMillis()- 10800000;
long totalSegundos = totalmilisegundos/1000;
long segundoatual = totalSegundos %60;
long totalMinutos = totalSegundos /60;
long minutoAtual = totalMinutos % 60;
long totalHora = totalMinutos /60;
long horaAtual = totalHora %24;
System.out.println(horaAtual + ":" + minutoAtual + ":" + segundoatual);
}
}
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