testsingleton.java

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package class_object;

class Company {	
	private static Company instance = new Company();
	private String name;	
	
	public static Company getInstance() {
		return instance;
	}
	
	//私有构造方法
	private Company() { 
	}
	
	public void setName(String name){
		this.name=name;		
	}
	
	public String getName(){
		return name;
	}
	
	public void shutDown(){
		System.out.println("The company "+name+" is shut down.");
	}
}

public class TestSingleton {

	public static void main(String[] args) {		
		Company c=Company.getInstance();
		c.setName("Microsoft");
		c.shutDown();
	}
}