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Java核心卷——static关键字与初始化大乱斗

乱世小白 2022-01-15 阅读 67
java

static

  • 归类所有,只初始化一次,并且当类加载的时候才开始初始化
  • 修饰变量 所有该类的对象共享一个静态变量
  • 修饰方法 直接用类名调用即可
  • 静态方法只能调用静态变量
class Test{
	public int i=1;
	public static int j=2;
	public void print(){
		System.out.println(j);//不报错
	}
	public static void main(String[] args){
		System.out.println(j);//不报错
		System.out.println(i);//报错
	}
}

初始化大乱斗

/**
 * @ClassName TRRest
 * @Description TODO
 * @Author heaboy@heaboy.com
 * @Version 1.0.0
 */
public class InitializeDemo {
    private static int k = 1;
    private static InitializeDemo t1 = new InitializeDemo("t1");
    private static InitializeDemo t2 = new InitializeDemo("t2");
    private static int i = print("i");
    private static int n = 99;

    {
        print("初始化块");
        j=100;
    }
    public InitializeDemo(String str) {
        System.out.println((k++) + ":" + str + "   i=" + i + "    n=" + n);
        ++i;
        ++n;

    }
    static {
        print("静态块");
        n=100;
    }
    private int j = print("j");
    public static int print(String str) {
        System.out.println((k++) + ":" + str + "   i=" + i + "    n=" + n);
        ++n;
        return ++i;
    }

    public static void main(String[] args) {
        InitializeDemo test = new InitializeDemo("test");
    }

}

在这里插入图片描述

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