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public class A {
private static A instance;
public A instance() {
if (instance == null) {
instance = new A();
}
return instance;
}
private A() {
}
}
[/quote]public class A {
private static final A instance = new A();
public A instance() {
return instance;
}
private A() {
}
}
[/quote]
public static A getInstance(){
……
}public class A {
private static A instance;
public A instance() {
if (instance == null) {
instance = new A();
}
return instance;
}
private A() {
}
}
[/quote]public class A {
private static final A instance = new A();
public A instance() {
return instance;
}
private A() {
}
}
public class A {
private static A instance;
public A instance() {
if (instance == null) {
instance = new A();
}
return instance;
}
private A() {
}
}