StreamSortTest/src/sig/JavaProjectTemplate.java

package sig;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.swing.JFrame;
import sig.engine.Panel;

class Vertex{
	double x,y,z;
	Vertex(double x,double y,double z) {
		this.x=x;
		this.y=y;
		this.z=z;
	}
	@Override
	public String toString() {
		return "Vertex [x=" + x + ", y=" + y + ", z=" + z + "]";
	}
}

class Triangle{
	Vertex a,b,c;
	Triangle(Vertex a,Vertex b,Vertex c) {
		this.a=a;
		this.b=b;
		this.c=c;
	}
	@Override
	public String toString() {
		return "Triangle [z= "+((a.z+b.z+c.z)/3f)+" ||| a=" + a + ", b=" + b + ", c=" + c + "]";
	}
}

public class JavaProjectTemplate {
	public static final String PROGRAM_NAME="Sig's Java Project Template";
	public static void main(String[] args) {
		List<Triangle> triList = new ArrayList<>();
		for (int i=0;i<30;i++) {
			triList.add(new Triangle(new Vertex(Math.random()*20-10,Math.random()*20-10,Math.random()*20-10),new Vertex(Math.random()*20-10,Math.random()*20-10,Math.random()*20-10),new Vertex(Math.random()*20-10,Math.random()*20-10,Math.random()*20-10)));
		}

		Stream<Triangle> triStream = triList.stream();
		List<Triangle> newList=triStream.sorted(new Comparator<Triangle>(){
			@Override
			public int compare(Triangle t1, Triangle t2) {
				double z1=(t1.a.z+t1.b.z+t1.c.z)/3f;
				double z2=(t2.a.z+t2.b.z+t2.c.z)/3f;
				return (z1<z2)?1:(z1==z2)?0:-1;
			}
		}).collect(Collectors.toList());

		System.out.println("Old List:");

		for (int i=0;i<30;i++) {
			System.out.println(triList.get(i));
		}


		System.out.println("New List:");

		for (int i=0;i<30;i++) {
			System.out.println(newList.get(i));
		}
	}
}