StackTraceElement源码

最新推荐文章于 2022-01-09 20:09:57 发布

原创最新推荐文章于 2022-01-09 20:09:57 发布 · 135 阅读

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本文深入解析了StackTraceElement类的实现细节，包括其构造方法、成员变量和各种方法如toString、equals和hashCode的实现。此外，还介绍了如何使用这些方法来获取和比较堆栈跟踪元素的信息。

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package java.lang;

import java.util.Objects;

public final class StackTraceElement implements java.io.Serializable {
private String declaringClass;
private String methodName;
private String fileName;
private int lineNumber;

public StackTraceElement(String declaringClass, String methodName,
String fileName, int lineNumber) {
this.declaringClass = Objects.requireNonNull(declaringClass, "Declaring class is null");
this.methodName = Objects.requireNonNull(methodName, "Method name is null");
this.fileName = fileName;
this.lineNumber = lineNumber;
}
public String getFileName() {
return fileName;
}
public int getLineNumber() {
return lineNumber;
}
public String getClassName() {
return declaringClass;
}
public String getMethodName() {
return methodName;
}
public boolean isNativeMethod() {
return lineNumber == -2;
}
public String toString() {
return getClassName() + "." + methodName +
(isNativeMethod() ? "(Native Method)" :
(fileName != null && lineNumber >= 0 ?
"(" + fileName + ":" + lineNumber + ")" :
(fileName != null ? "("+fileName+")" : "(Unknown Source)")));
}

public boolean equals(Object obj) {
if (obj==this)
return true;
if (!(obj instanceof StackTraceElement))
return false;
StackTraceElement e = (StackTraceElement)obj;
return e.declaringClass.equals(declaringClass) &&
e.lineNumber == lineNumber &&
Objects.equals(methodName, e.methodName) &&
Objects.equals(fileName, e.fileName);
}
public int hashCode() {
int result = 31*declaringClass.hashCode() + methodName.hashCode();
result = 31*result + Objects.hashCode(fileName);
result = 31*result + lineNumber;
return result;
}