why notify and notifyall in object class

why notify and notifyall in object class

For better understanding why wait() and notify() method belongs to Object class, I ll give you a real life example: Suppose a gas station has a single toilet, the key for which is kept at the service desk. The toilet is a shared resource for passing motorists. To use this shared resource the prospective user must acquire a key to the lock on the toilet. The user goes to the service desk and acquires the key, opens the door, locks it from the inside and uses the facilities. Meanwhile, if a second prospective user arrives at the gas station he finds the toilet locked and therefore unavailable to him. He goes to the service desk but the key is not there because it is in the hands of the current user. When the current user finishes, he unlocks the door and returns the key to the service

 why do stars appear to move across the sky

why do stars appear to move across the sky

Objects such as stars appear to move across the sky at night because Earth spins on its axis. This is the same reason that the sun rises in the east and sets in the west. Stars that are low in the east when the night begins are high in the sky halfway through the night and low in the west by daybreak the next day. During the day, the stars continue to move across the sky, but the sun is so bright that they canвt be seen. Of course, the stars arenвt moving relative to the Earth's position in space. They just appear to move to human stargazers. The stars move across the sky a little faster than the sun. This difference arises because the stars appear to move only because of Earthвs rotation, while the sun also appears to move because the Earth goes around the sun once a year. This

 why you re not married yet book

why you re not married yet book

If your love life is perpetually in the dumps, then Tracy McMillan has a word of advice: itБs not him, itБs you. The author of the wildly popular Huffington Post article has written a book by the same title,. Beliefnet interviewed Tracy on what women are doing wrong to sabotage their relationships. YouБre very open about your own romantic misadventures and the things youБve done wrong in previous relationships. Is that part of what inspired this book? Why did you choose to be so honest? This book definitely draws on my own experiences in relationships, as well as those of hundreds of women I've talked to over the years. I look at these ten chapters as spiritual challenges that face every woman Б no matter what stage of relationship she's in. Single, married, dating. everyone can relate to

 why do we need trees in our environment

why do we need trees in our environment

Trees are vital. As the biggest plants on the planet, they give us oxygen, store carbon, stabilise the soil and give life to the world s wildlife. They also provide us with the materials for tools and shelter. Not only are trees essential for life, but as the longest living species on earth, they give us a link between the past, present and future. It s critical that woodlands, rainforests and trees in urban settings, such as parks, are preserved and sustainably managed across the world. Play your part and today. The canopies of trees act as a physical filter, trapping dust and absorbing pollutants from the air. Each individual tree removes up to 1. 7 kilos every year. They also provide shade from solar radiation and reduce noise. Over 20 species of British trees and shrubs are known to

 why do you look like your parents

why do you look like your parents

Meiosis reduces the number of chromosome sets from two (diploid) to one (haploid), whereas mitosis conserves the number of chromosome sets. Therefore, mitosis produces daughter cells genetically identical to their parent cell and to each other, whereas meiosis produces cells that differ genetically from their parent cell and from each other. While in mitosis, genes are generally transferred faithfully from one cellular generation to the next; in meiosis and subsequent sexual reproduction, genes get mixed up. Sexual reproduction actually expands the variety created by meiosis, because it combines the different varieties of parental genotypes. Thus, because of recombination and sexual reproduction, there are trillions of possible genotypes in the human species. Thus, both mitosis and

 why do we have to pay property taxes

why do we have to pay property taxes

November 16, 2015 by filed under. If you own a home, business location, or another piece of real estate, youБve probably wondered why exactly you have to pay property taxes, especially when your bill comes every November. Feeling frustrated about these fees certainly isnБt uncommonБ Reading Eagle Business Weekly piece on the topic, Michael L. Young explains: Бaccording to the Tax Foundation and other sources, the most hated tax in America is actually the local property tax. Б People despise these duties for several practical reasonsБtheyБre a pain to assess and collect, they end up getting raised regularly because property values ББgrowБ with the economy slowly,Б and theyБre Бgenerally regressive, which makes them unfairБ for those with lower incomes. In addition to these concerns, one

 why do we need to conserve forests

why do we need to conserve forests

We depend on the forests for a number of resources, which is why it is so important that we do all we can to conserve the trees and plants that we still have. Forest conservation has become a worldwide concern. If you want to know more about how you can do your part, it will help to know about the types of forest conservation that is necessary for each type of forest. The places that are of great concern these days are the tropical forests, and there are several different types. The most popular type, perhaps, is the rain forest, the largest of which still remain in places like Brazil and Malaysia. However, about one and a half acres are lost every second of every day. This is due to humans using the trees and natural resources there for industrial purposes. ...

 why do we cut down the amazon rainforest

why do we cut down the amazon rainforest

Why are they being destroyed? In the past 50 years much of the rainforest in Africa and Asia has been destroyed. Large areas of rainforest are being cut down, often in order to remove just a few logs, and rainforest is being destroyed at double the rate of all previous estimates. Unfortunately this means that there is a very high rate of extinction, as the wildlife depending on the forest dies with it. Many rainforests in Central and South America have been burnt down to make way for cattle farming, which supplies cheap beef to North America, China and Russia. It is estimated that for each pound of beef produced, 200 square feet of rainforest is destroyed. In the past 20 years Costa Rica has lost the majority of its forests to beef cattle ranching. This is known as slash and burn farming

 why dont you have some dirty hot sex with me

why dont you have some dirty hot sex with me

It's been a while since I've seen your face Gotta say I'm happy to see you come around my place Now, I think we've talked about it And I think I know whats coming up next Let's put our minds away And let our hormones do the rest Does it seem obscene? Does it seem like a bad thing? Well if it is I'm sorry miss, but you know I'm just 19 So don't be afraid when my pants start to leak You know damn well I'm in my sexual peak Well. Why don't you have some dirty hot sex with me? It ain't like I'm asking you to give it up for free We can start it right now Baby get on your knees Don't make me beg again Girl I just said please, please Yeah Now when you look down don't be mislead I found my life purpose and it's getting upstairs into your bed Now, there's a phone girl,

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