Can anyone explain this code for me

Hi I am new to java, I have a bit of code that I would like explaining, stuff like what are the methods what are the variables what are the arrays, and what the code is doing. Any help would be appreciated. Thanks

Code :

public DetectorArray constructArray2(Gate1D timegate, boolean diagonals, boolean allowbad) {
 
	// Some variables
	boolean valid,fail,pileup,veto;
	double sum, max, theta, phi;
	long t;
 
 
	DetectorArray result = new DetectorArray();
 
 
	ArrayList cclist[] = new ArrayList[24];
	for(int i=0;i<cclist.length;i++){
	    cclist[i]= new ArrayList<Detector>(0);
	}
	for( Detector ge: event.clos.ges){
	    if(timegate.passes(event.stamp-ge.time)){
		((ArrayList<Detector>)cclist[ge.number/4]).add(ge);
	    }
	}
 
 
	for(int i=0;i<cclist.length;i++){
 
	    switch (cclist[i].size()){
	    case 1:
		// Single detector hit case
		// Pull out the hit
		Detector ge = ((ArrayList<Detector>)cclist[i]).get(0);
		// Create and store the new detector object
		if((!ge.fail && !ge.piledup && !ge.vetoed ) || allowbad)
		    result.ges.add(new Detector(i+16,(i/12)+4,ge.theta,ge.phi,ge.e,ge.time,1,ge.valid,ge.fail,ge.piledup,ge.vetoed));
		break;
		}
		}
 
			for( Detector ge: event.ph1s.ges){
			    if(timegate.passes(event.stamp-ge.time))result.ges.add(ge);
			}
			return result;