Java中變數的宣告與初始化

int count = 10;  // valor inicial
char ch = 'X';   // inicializa com 'X'
float f = 1.2F;  // inicializa com 1.2

double volume = 3.1416 * radius * radius * height;

int x = 10;
if(x == 10) {
  int y = 20;
  System.out.println("x and y: " + x + " " + y);
  x = y * 2;
}
System.out.println("x is " + x);

for(int x = 0; x < 3; x++) {
  int y = -1;
  System.out.println("y is: " + y);
  y = 100;
  System.out.println("y is now: " + y);
}

// Este programa não será compilado
int count;
for(count = 0; count < 10; count++) {
  int count;  // inválido
  for(count = 0; count < 2; count++)
    System.out.println("This program is in error!");
}