testsystem.java

本书是一本为Java学习者在基础内容学习结束后进行课程设计时提供参考的指导书

package apibook.c2.s3;

public class TestSystem {
  public static void main(String[] args) {
    long t1=System.currentTimeMillis();
    Object[] obj1=new Object[]{"green","yellow","blue","red"};
    System.out.println(obj1[0]+"|"+obj1[1]+"|"+obj1[2]+"|"+obj1[3]);
    System.out.println(System.getProperty("user.dir"));
    Object[] obj2=new Object[]{"","","",""};
    System.arraycopy(obj1,0,obj2,0,4);
    System.out.println(obj2[0]+"|"+obj2[1]+"|"+obj2[2]+"|"+obj2[3]);
    for (int i=0;i<5000 ;i++ ) {
    }
    long t2=System.currentTimeMillis();
    System.out.println(t2-t1);
  }
}