标签：
1. 每一个非基本类型的对象都有一个toString方法，而且当编译器需要一个String而你却只有一个对象时，该方法便会被调用。public class SprinklerSystem {
private String valve；
public String toString() {
value = "test";
return "valve = " + valve;
}
public static void main(String[] args) {
SprinklerSystem sprinklers = new SprinklerSystem();
System.out.println(sprinklers);
}
}
/* Output:
value = "test";
*///:~
class Art {
Art() {
print("Art constructor");
}
}
class Drawing extends Art {
Drawing() {
print("Drawing constructor");
}
}
public class Cartoon extends Drawing {
public Cartoon() {
print("Cartoon constructor");
}
public static void main(String[] args) {
Cartoon x = new Cartoon();
}
}
/* Output:
Art constructor
Drawing constructor
Cartoon constructor
*///:~public class FinalArguments {
void with(final Gizmo g) {
//! g = new Gizmo(); // Illegal -- g is final
}
}class Insect {
private int i = 9;
protected int j;
Insect() {
print("i = " + i + ", j = " + j);
j = 39;
}
private static int x1 = printInit("static Insect.x1 initialized");
static int printInit(String s) {
print(s);
return 47;
}
}
public class Beetle extends Insect {
private int k = printInit("Beetle.k initialized");
public Beetle() {
print("k = " + k);
print("j = " + j);
}
private static int x2 = printInit("static Beetle.x2 initialized");
public static void main(String[] args) {
print("Beetle constructor");
Beetle b = new Beetle();
}
}
/* Output:
static Insect.x1 initialized
static Beetle.x2 initialized
Beetle constructor
i = 9, j = 0
Beetle.k initialized
k = 47
j = 39
*///:~标签：
原文地址：http://blog.csdn.net/zdp072/article/details/43056625
