Java异常--常见方法--自定义异常--增强try(try-with-resources)详解

//返回此可抛出对象的详细信息消息字符串
public String getMessage() 

//将此可抛发对象及其回溯到标准错误流。此方法在错误输出流上打印此 Throwable 对象的堆栈跟踪
//最为详细
public void printStackTrace()
//返回此可抛件的简短说明
public String toString()

 try{
            int i = 1/0;
        } catch(Exception e){
            System.out.println("e = " + e);
            System.out.println("-----------------");
            System.out.println("e.getMessage() = " + e.getMessage());
            System.out.println("-----------------");
            System.out.println("e.getStackTrace() = " + Arrays.toString(e.getStackTrace()));
            System.out.println("-----------------");
            System.out.println("e.getLocalizedMessage() = " + e.getLocalizedMessage());
            System.out.println("-----------------");
            System.out.println("e.getCause() = " + e.getCause());
            System.out.println("-----------------");
            System.out.println("e.getClass() = " + e.getClass());
            System.out.println("-----------------");
            System.out.println("e.getSuppressed() = " + Arrays.toString(e.getSuppressed()));

        }

e = java.lang.ArithmeticException: / by zero
-----------------
e.getMessage() = / by zero
-----------------
e.getStackTrace() = [省略27行，com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)]
-----------------
//可能的原因
e.getCause() = null
-----------------
//一个数组，其中包含为传递此异常而禁止显示的所有异常。
//就是用try捕获却不做事的
e.getSuppressed() = []

try(创建对象资源1；创建对象资源2){

}catch(){
}

BufferedInputStream b = null;
try {
    b = new BufferedInputStream(new FileInputStream(""));
}catch (Exception e) {
    e.printStackTrace();
}finally {
    if (b!=null) {
        try {
            b.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

try (BufferedInputStream b = new BufferedInputStream(new FileInputStream(""));){
    
}catch (Exception e) {
    e.printStackTrace();
}

创建对象1
创建对象2
try(变量名1；变量名2){
}catch(){
}

public void testTryWithResource() throws FileNotFoundException {
    BufferedInputStream b = new BufferedInputStream(new FileInputStream(""));
    try (b) {

    } catch (Exception e) {
        e.printStackTrace();
    }
}