Java异常处理try catch的基本用法

package Bird;
 
import java.io.FileNotFoundException;
import java.io.FileReader;
 
//
public class TestYc {
	public static void main(String[] args) {
		try{
			FileReader fr = new FileReader("c:/abc.txt");
					} catch (FileNotFoundException e) {
						//打印输出异常
						e.printStackTrace();
					}		
	
	Mother mother  = new Mother();
	mother.bbb();
	//1.編譯時異常
	//讀取該路徑"c:/abc.txt"下的文件
	/* try {
		 FileReader fr = new FileReader("c:/abc.txt");
	 }catch(FileNotFoundException e) {
		//打印输出异常
			e.printStackTrace();
	 }*/
	int [] arr = new int[] {1,2,3};
	System.out.println(arr[2]);
	}
}
 
class Mother {
 
	private Boy b = null;
 
	// 构造器
	public Mother() {
 
		b = new Boy();
 
	}
 
	public void bbb() {
		// TODO Auto-generated method stub
		//调用带有异常的方法
		try {
			b.aaa();
		}catch(FileNotFoundException e) {
			e.printStackTrace();
			
		}
		
	}
}
 
class Boy {
	// throws 把异常抛给上层的调用者
	public  void aaa() throws FileNotFoundException{
		FileReader fr = new FileReader("c:/abc.txt");
	}
}