File	Doc	Category	Size	Date	Package
StackTraceElement.java	API Doc	Java SE 5 API	8729	Fri Aug 26 14:57:04 BST 2005	java.lang

StackTraceElement

• java.lang.Object

Fields Summary
private String	declaringClass
private String	methodName
private String	fileName
private int	lineNumber
private static final long	serialVersionUID

Constructors Summary

public StackTraceElement(String declaringClass, String methodName, String fileName, int lineNumber) Creates a stack trace element representing the specified execution point. param declaringClass the fully qualified name of the class containing the execution point represented by the stack trace element param methodName the name of the method containing the execution point represented by the stack trace element param fileName the name of the file containing the execution point represented by the stack trace element, or null if this information is unavailable param lineNumber the line number of the source line containing the execution point represented by this stack trace element, or a negative number if this information is unavailable. A value of -2 indicates that the method containing the execution point is a native method throws NullPointerException if declaringClass or methodName is null since 1.5 if (declaringClass == null) throw new NullPointerException("Declaring class is null"); if (methodName == null) throw new NullPointerException("Method name is null"); this.declaringClass = declaringClass; this.methodName = methodName; this.fileName = fileName; this.lineNumber = lineNumber;

Methods Summary
private static boolean	eq(java.lang.Object a, java.lang.Object b) return a==b || (a != null && a.equals(b));
public boolean	equals(java.lang.Object obj) Returns true if the specified object is another StackTraceElement instance representing the same execution point as this instance. Two stack trace elements a and b are equal if and only if: equals(a.getFileName(), b.getFileName()) && a.getLineNumber() == b.getLineNumber()) && equals(a.getClassName(), b.getClassName()) && equals(a.getMethodName(), b.getMethodName()) where equals is defined as: static boolean equals(Object a, Object b) { return a==b || (a != null && a.equals(b)); } param obj the object to be compared with this stack trace element. return true if the specified object is another StackTraceElement instance representing the same execution point as this instance. if (obj==this) return true; if (!(obj instanceof StackTraceElement)) return false; StackTraceElement e = (StackTraceElement)obj; return e.declaringClass.equals(declaringClass) && e.lineNumber == lineNumber && eq(methodName, e.methodName) && eq(fileName, e.fileName);
public java.lang.String	getClassName() Returns the fully qualified name of the class containing the execution point represented by this stack trace element. return the fully qualified name of the Class containing the execution point represented by this stack trace element. return declaringClass;
public java.lang.String	getFileName() Returns the name of the source file containing the execution point represented by this stack trace element. Generally, this corresponds to the SourceFile attribute of the relevant class file (as per The Java Virtual Machine Specification, Section 4.7.7). In some systems, the name may refer to some source code unit other than a file, such as an entry in source repository. return the name of the file containing the execution point represented by this stack trace element, or null if this information is unavailable. return fileName;
public int	getLineNumber() Returns the line number of the source line containing the execution point represented by this stack trace element. Generally, this is derived from the LineNumberTable attribute of the relevant class file (as per The Java Virtual Machine Specification, Section 4.7.8). return the line number of the source line containing the execution point represented by this stack trace element, or a negative number if this information is unavailable. return lineNumber;
public java.lang.String	getMethodName() Returns the name of the method containing the execution point represented by this stack trace element. If the execution point is contained in an instance or class initializer, this method will return the appropriate special method name, <init> or <clinit>, as per Section 3.9 of The Java Virtual Machine Specification. return the name of the method containing the execution point represented by this stack trace element. return methodName;
public int	hashCode() Returns a hash code value for this stack trace element. int result = 31*declaringClass.hashCode() + methodName.hashCode(); result = 31*result + (fileName == null ? 0 : fileName.hashCode()); result = 31*result + lineNumber; return result;
public boolean	isNativeMethod() Returns true if the method containing the execution point represented by this stack trace element is a native method. return true if the method containing the execution point represented by this stack trace element is a native method. return lineNumber == -2;
public java.lang.String	toString() Returns a string representation of this stack trace element. The format of this string depends on the implementation, but the following examples may be regarded as typical: "MyClass.mash(MyClass.java:9)" - Here, "MyClass" is the fully-qualified name of the class containing the execution point represented by this stack trace element, "mash" is the name of the method containing the execution point, "MyClass.java" is the source file containing the execution point, and "9" is the line number of the source line containing the execution point. "MyClass.mash(MyClass.java)" - As above, but the line number is unavailable. "MyClass.mash(Unknown Source)" - As above, but neither the file name nor the line number are available. "MyClass.mash(Native Method)" - As above, but neither the file name nor the line number are available, and the method containing the execution point is known to be a native method. see Throwable#printStackTrace() return getClassName() + "." + methodName + (isNativeMethod() ? "(Native Method)" : (fileName != null && lineNumber >= 0 ? "(" + fileName + ":" + lineNumber + ")" : (fileName != null ? "("+fileName+")" : "(Unknown Source)")));