从对象字段更改变量值

Question

以下是我的代码：

package com.collegeselector;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;



public class CollegeList extends ListActivity {

ArrayList<CollegeItem> collegeLists=new ArrayList<CollegeItem>();
ArrayList<String> nameList = new ArrayList<String>();

Comparator<CollegeItem> compare = new Comparator<CollegeItem>(){
    public int compare(CollegeItem a, CollegeItem b){
            return Double.compare(a.getScoreDistance(), b.getScoreDistance());
    }
};


CollegeItem michigan = new CollegeItem(3.79,30,2020,"University of Michigan","Ann Arbor, Michigan",true,false,true,false,true,true,true,true,true,true,true,true);
CollegeItem berkeley = new CollegeItem(3.84,30,2040,"University of California Berkeley","Berkeley, California",false,false,true,true,true,true,true,true,true,true,true,true);
CollegeItem stanford = new CollegeItem(3.96,33,2215,"Stanford University","Stanford, California",true,false,true,true,true,true,true,true,true,true,true,true);
CollegeItem mit = new CollegeItem(3.92,33,2206,"Massachusetts Institute of Technology","Cambridge,Massachusetts",true,false,true,true,true,true,true,true,true,true,true,true);
CollegeItem cit = new CollegeItem(3.95,34,2300,"California Institute of Technology","Pasadena,California",true,false,false,true,false,true,true,true,false,false,false,true);
CollegeItem git = new CollegeItem(3.9,30,2010,"Georgia Institute of Technology","Atlanta,Georgia",true,false,true,true,true,true,true,false,true,true,true,true);
CollegeItem uiuc = new CollegeItem(3.4,28,1975,"University of Illinois at Urbana-Champaign","Champaign,Illinois",true,true,false,false,true,true,true,true,true,false,true,true);
CollegeItem carnegie = new CollegeItem(3.69,31,2100,"Carnegie Mellon University","Pittsburgh, Pennsylvania",false,false,false,false,false,true,true,false,true,false,true,false);
CollegeItem cornell = new CollegeItem(3.87,31,2150,"Cornell Univeristy","Ithaca, New York",false,true,false,true,true,true,true,false,true,false,true,true);
CollegeItem princeton = new CollegeItem(3.87,33,2260,"Princeton University","Princeton, New Jersey",true,false,false,true,false,false,false,false,false,false,false,false);
CollegeItem purdue = new CollegeItem(3.7,27,1749,"Purdue University","West Lafayette, Indiana",true,true,false,false,true,false,true,false,false,true,false,true);
CollegeItem utaustin = new CollegeItem(3.72,28,1854,"University of Texas at Austin","Austin, Texas",true,false,false,true,true,true,false,false,true,false,false,true);
CollegeItem northwestern = new CollegeItem(3.8,32,2155,"Northwestern University","Evanston, Illinois",false,false,false,false,false,false,false,false,false,true,true,false);
CollegeItem wisconsin = new CollegeItem(3.84,28,1905,"University of Wisconsin-Madison","Madison, Wisconsin",false,false,false,true,false,false,false,false,false,true,false,false);
CollegeItem calpoly = new CollegeItem(3.87,28,1838,"California Polytechnic State University, San Luis Obispo","San Luis Obispo, California",false,false,false,false,false,false,false,false,false,false,false,false);
CollegeItem johnshopkins = new CollegeItem(3.72,32,2103,"Johns Hopkins University","Baltimore, Maryland",false,false,true,false,false,false,false,false,true,false,false,false);
CollegeItem pennstate = new CollegeItem(3.59,27,1778,"Pennsylvania State University-University Park","University Park, Pennsylvania",false,false,false,false,false,false,false,true,false,true,true,false);
CollegeItem rice = new CollegeItem(3.87,32,2155,"Rice University","Houston, Texas",false,false,true,false,false,false,false,false,false,false,false,false);
CollegeItem texasam = new CollegeItem(3.6,27,1755,"Texas A&M University","College Station, Texas",false,true,false,false,false,false,false,false,false,true,false,false);
CollegeItem vtech = new CollegeItem(3.77,28,1823,"Virginia Tech","Blacksburg, Virginia",false,false,false,false,true,false,false,true,false,true,false,false);







@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    collegeLists.add(michigan);collegeLists.add(purdue);
    collegeLists.add(berkeley);collegeLists.add(utaustin);
    collegeLists.add(stanford);collegeLists.add(northwestern);
    collegeLists.add(mit);collegeLists.add(wisconsin);
    collegeLists.add(cit);collegeLists.add(calpoly);
    collegeLists.add(git);collegeLists.add(johnshopkins);
    collegeLists.add(uiuc);collegeLists.add(pennstate);
    collegeLists.add(carnegie);collegeLists.add(rice);
    collegeLists.add(cornell);collegeLists.add(texasam);
    collegeLists.add(princeton);collegeLists.add(vtech);



    Collections.sort(collegeLists, compare);

    for(CollegeItem collegeList : collegeLists){
        nameList.add(collegeList.getName());
    }

    setListAdapter(new ArrayAdapter<String>(CollegeList.this, android.R.layout.simple_list_item_1, nameList));



}
private class CollegeItem {
private double gpa;
private int act;
private int sat;
private String name;
private String location;
private double score;
private boolean match;
private double scoreDistance;

private boolean uaero, uagri, ubio, uchem, ucivil, ucomp, uelec, uphys, uenvi, uindus, umate, umech;

public CollegeItem(double gpa, int act, int sat, String name, String location, boolean uaero, boolean uagri, boolean ubio, boolean uchem,
                    boolean ucivil, boolean ucomp, boolean uelec, boolean uphys, boolean uenvi, boolean uindus, boolean umate, boolean umech){
    this.gpa = gpa;
    this.act = act;
    this.sat = sat;
    this.name = name;
    this.location = location;
    this.uaero = uaero;
    this.uagri = uagri;
    this.ubio = ubio;
    this.uchem = uchem;
    this.ucivil = ucivil;
    this.ucomp = ucomp;
    this.uelec = uelec;
    this.uphys = uphys;
    this.uenvi = uenvi;
    this.uindus = uindus;
    this.umate = umate;
    this.umech = umech;

    if(act/36.0>sat/2400.0){
        this.score = 0.6*gpa*25.0+0.4*(act/36.0)*100.0;
    }else{
        this.score = 0.6*gpa*25.0+0.4*(sat/2400.0)*100.0;
    }
    scoreDistance = Math.abs(this.score-MainActivity.scoreDouble)/MainActivity.scoreDouble;
    if(uaero&&ListOfMajors.aerospace)
        match = true;
    if(uagri&&ListOfMajors.agricultural)
        match = true;
    if(ubio&&ListOfMajors.biomed)
        match = true;
    if(uchem&&ListOfMajors.chem)
        match = true;
    if(ucivil&&ListOfMajors.civil)
        match = true;
    if(ucomp&&ListOfMajors.computer)
        match = true;
    if(uelec&&ListOfMajors.electrical)
        match = true;
    if(uphys&&ListOfMajors.physics)
        match = true;
    if(uenvi&&ListOfMajors.environment)
        match = true;
    if(uindus&&ListOfMajors.industrial)
        match = true;
    if(umate&&ListOfMajors.materials)
        match = true;
    if(umech&&ListOfMajors.mechanical)
        match = true;
}

public String getName(){
    return this.name;
}
public double getScoreDistance(){
    return this.scoreDistance;
}

CheckList活动

public class ListOfMajors extends Activity {

    boolean[] mItemState;
    public static boolean aerospace, agricultural, biomed, chem, civil, computer, electrical, physics, environment, industrial, materials, mechanical;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.majorslist);
        ListView mylist = (ListView) findViewById(R.id.majorslist);
        final String[] list={"Aerospace Engineering","Agricultural Engineering",
                "Biomedical Engineering","Chemical Engineering","Civil Engineering",
                "Computer Engineering","Electrical Engineering","Engineering Physics", 
                "Environmental Engineering","Industrial Engineering",
                "Materials Engineering","Mechanical Engineering"};
        mItemState = new boolean[list.length];
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(ListOfMajors.this,android.R.layout.simple_list_item_multiple_choice,list);
        mylist.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        mylist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                // Toggle the state
                mItemState[position] = !mItemState[position];
                if (mItemState[position])
                    switch(position){
                        case 0: aerospace = true;
                        case 1: agricultural = true;
                        case 2: biomed = true;
                        case 3: chem = true;
                        case 4: civil = true;
                        case 5: computer = true;
                        case 6: electrical = true;
                        case 7: physics = true;
                        case 8: environment = true;
                        case 9: industrial = true;
                        case 10: materials = true;
                        case 11: mechanical = true;                             
                    }

                else{
                    switch(position){
                        case 0: aerospace = false;
                        case 1: agricultural = false;
                        case 2: biomed = false;
                        case 3: chem = false;
                        case 4: civil = false;
                        case 5: computer = false;
                        case 6: electrical = false;
                        case 7: physics = false;
                        case 8: environment = false;
                        case 9: industrial = false;
                        case 10: materials = false;
                        case 11: mechanical = false;                                
                    }
                }

            }
        });

        mylist.setAdapter(adapter); 
    }

}

诸如uaero和uagri之类的变量是对象的布尔字段。我在这堂课里有很多东西。 ListOfMajors.aerospace和ListOfMajors.agricultural等变量是来自另一个类的布尔值，如果单击一个复选框，则设置为true。所有这些变量对彼此对应，并且如果两个其他变量都为真，则希望变量匹配设置为true。截至目前，代码似乎没有工作，因为匹配似乎没有变为true。我该怎么做才能让它发挥作用？

Answer 1

您的案例可能没有按照您的想法进行..因为没有中断案例位置0会将所有变量设置为true（或者为假）

 switch(position){
                        case 0: aerospace = true; break;
                        case 1: agricultural = true;break;
                        case 2: biomed = true;break;
                        case 3: chem = true;break;
                        case 4: civil = true;break;
                        case 5: computer = true;break;
                        case 6: electrical = true;break;
                        case 7: physics = true;break;
                        case 8: environment = true;break;
                        case 9: industrial = true;break;
                        case 10: materials = true;break;
                        case 11: mechanical = true;   break;                          
                    }