eclipse JDT setting the project - eclipse-plugin

Question

I am a beginner to Eclipse JDT. I was going through some tutorial and found one good example for creating the java file. In this below example in which project they will create the package and java file. I could not see any code pointing to any of the project name. Please make me understand if I am wrong. I just run the below example. I could not see any output..
AST ast = AST.newAST(AST.JLS3);
CompilationUnit unit = ast.newCompilationUnit();
PackageDeclaration packageDeclaration = ast.newPackageDeclaration();
packageDeclaration.setName(ast.newSimpleName("example"));
unit.setPackage(packageDeclaration);
ImportDeclaration importDeclaration = ast.newImportDeclaration();
QualifiedName name =
ast.newQualifiedName(
ast.newSimpleName("java"),
ast.newSimpleName("util"));
importDeclaration.setName(name);
importDeclaration.setOnDemand(true);
unit.imports().add(importDeclaration);
TypeDeclaration type = ast.newTypeDeclaration();
type.setInterface(false);
type.modifiers().add(ast.newModifier(Modifier.ModifierKeyword.PUBLIC_KEYWORD));
type.setName(ast.newSimpleName("HelloWorld"));
MethodDeclaration methodDeclaration = ast.newMethodDeclaration();
methodDeclaration.setConstructor(false);
List modifiers = methodDeclaration.modifiers();
modifiers.add(ast.newModifier(Modifier.ModifierKeyword.PUBLIC_KEYWORD));
modifiers.add(ast.newModifier(Modifier.ModifierKeyword.STATIC_KEYWORD));
methodDeclaration.setName(ast.newSimpleName("main"));
methodDeclaration.setReturnType2(ast.newPrimitiveType(PrimitiveType.VOID));
SingleVariableDeclaration variableDeclaration = ast.newSingleVariableDeclaration();
variableDeclaration.setType(ast.newArrayType(ast.newSimpleType(ast.newSimpleName("String"))));
variableDeclaration.setName(ast.newSimpleName("args"));
methodDeclaration.parameters().add(variableDeclaration);
org.eclipse.jdt.core.dom.Block block = ast.newBlock();
MethodInvocation methodInvocation = ast.newMethodInvocation();
name =
ast.newQualifiedName(
ast.newSimpleName("System"),
ast.newSimpleName("out"));
methodInvocation.setExpression(name);
methodInvocation.setName(ast.newSimpleName("println"));
InfixExpression infixExpression = ast.newInfixExpression();
infixExpression.setOperator(InfixExpression.Operator.PLUS);
StringLiteral literal = ast.newStringLiteral();
literal.setLiteralValue("Hello");
infixExpression.setLeftOperand(literal);
literal = ast.newStringLiteral();
literal.setLiteralValue(" world");
infixExpression.setRightOperand(literal);
methodInvocation.arguments().add(infixExpression);
ExpressionStatement expressionStatement = ast.newExpressionStatement(methodInvocation);
block.statements().add(expressionStatement);
methodDeclaration.setBody(block);
type.bodyDeclarations().add(methodDeclaration);
unit.types().add(type);

Answer 1

You may take a look at this. It uses Java Model, which means you will need to create a plug-in to make it work.
// create a project with name "TESTJDT"
IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IProject project = root.getProject("TESTJDT");
project.create(null);
project.open(null);
//set the Java nature
IProjectDescription description = project.getDescription();
description.setNatureIds(new String[] { JavaCore.NATURE_ID });
//create the project
project.setDescription(description, null);
IJavaProject javaProject = JavaCore.create(project);
//set the build path
IClasspathEntry[] buildPath = {
JavaCore.newSourceEntry(project.getFullPath().append("src")),
JavaRuntime.getDefaultJREContainerEntry() };
javaProject.setRawClasspath(buildPath, project.getFullPath().append(
"bin"), null);
//create folder by using resources package
IFolder folder = project.getFolder("src");
folder.create(true, true, null);
//Add folder to Java element
IPackageFragmentRoot srcFolder = javaProject
.getPackageFragmentRoot(folder);
//create package fragment
IPackageFragment fragment = srcFolder.createPackageFragment(
"com.programcreek", true, null);
//init code string and create compilation unit
String str = "package com.programcreek;" + "\n"
+ "public class Test {" + "\n" + " private String name;"
+ "\n" + "}";
ICompilationUnit cu = fragment.createCompilationUnit("Test.java", str,
false, null);
//create a field
IType type = cu.getType("Test");
type.createField("private String age;", null, true, null);