Java 中可抛出的 setStackTrace()方法,带示例
原文:https://www . geeksforgeeks . org/throwable-setstacktrace-method-in-Java-with-examples/
Throwable 类的setstack trace(stack trace element【】stack trace)方法是用来将堆栈跟踪元素设置到这个 Throwable 对象,这个堆栈跟踪将由 getStackTrace()返回,并由 printStackTrace()和相关方法打印。此方法允许用户重写默认堆栈跟踪,该跟踪在构造可抛出对象时由 fillInStackTrace()生成,或者在从序列化流中读取可抛出对象时反序列化。 如果任何 Throwable 的堆栈跟踪不可写,那么调用此方法除了验证其参数之外没有任何作用。 语法:
public void
setStackTrace(StackTraceElement[] stackTrace)
参数:该方法只接受一个参数 stackTrace ,即与该可投掷物关联的堆栈微量元素。 返回:此方法不返回任何内容。 以下程序说明了 setStackTrace()方法: 示例 1:
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to demonstrate
// the setStackTrace () Method.
import java.io.*;
class GFG {
// Main Method
public static void main(String[] args)
throws Exception
{
try {
testException1();
}
catch (Throwable e) {
// access to the stack trace
StackTraceElement[] trace = e.getStackTrace();
System.out.println(trace[0].toString());
}
}
// method which throws Exception
public static void testException1()
throws Exception
{
// create a new Exception
Exception ex = new Exception();
StackTraceElement[] trace = new StackTraceElement[] {
new StackTraceElement("ClassNameOfExe",
"methodNameOfExe",
"fileNameOfExe",
10)
};
// sets the stack trace elements
ex.setStackTrace(trace);
// throw the Throwable[
throw ex;
}
}
Output:
ClassNameOfExe.methodNameOfExe(fileNameOfExe:10)
例 2:
Java 语言(一种计算机语言,尤用于创建网站)
// Java program to demonstrate
// the setStackTrace () Method.
import java.io.*;
class GFG {
// Main Method
public static void main(String[] args)
throws Exception
{
try {
Exceptiontest();
}
catch (Throwable e) {
// access to the stack trace
StackTraceElement[] trace = e.getStackTrace();
System.out.println("StackTraceElement length :"
+ trace.length);
for (int i = 0; i < trace.length; i++) {
System.out.println("Stack Trace at index "
+ i + " : "
+ trace[i]);
}
}
}
// method which throws Exception
public static void Exceptiontest()
throws Exception
{
// create a new Exception
ArrayStoreException ex = new ArrayStoreException();
StackTraceElement[] trace = new StackTraceElement[] {
new StackTraceElement("ClassName1", "methodName1",
"fileName1", 10),
new StackTraceElement("ClassName2", "methodName2",
"fileName2", 20),
new StackTraceElement("ClassName3", "methodName3",
"fileName3", 14)
};
// sets the stack trace elements
ex.setStackTrace(trace);
throw ex;
}
}
Output:
StackTraceElement length :3
Stack Trace at index 0 : ClassName1.methodName1(fileName1:10)
Stack Trace at index 1 : ClassName2.methodName2(fileName2:20)
Stack Trace at index 2 : ClassName3.methodName3(fileName3:14)
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