a=new String[]{"班","云","学","学","教","考","结","加"}; b=new String[]{"无","未","上","暂","暂","暂","","允"}; List<Map<String,Object>> mapList2=new ArrayList<Map<String,Object>>(); for(int j=0;j<8;j++){ Map<String,Object> listitem2=new HashMap<String,Object>(); listitem2.put("a",a[j]); listitem2.put("b",b[j]); mapList2.add(listitem2); } SimpleAdapter adapter2=new SimpleAdapter(this,mapList2,R.layout.item3,new String[]{"a","b"},new int[]{R.id.textView10,R.id.textView11}); listView2.setAdapter(adapter);错哪了

这段代码中存在以下问题：

1. `b` 数组中第七个元素为空字符串，应该改为 `"暂"` 或者其他非空字符串。

2. 在创建 `SimpleAdapter` 对象时，使用了错误的参数 `adapter`，应该改为 `adapter2`。

修改后的代码如下：

a = new String[]{"班", "云", "学", "学", "教", "考", "结", "加"};         
b = new String[]{"无", "未", "上", "暂", "暂", "暂", "暂", "允"};         
List<Map<String,Object>> mapList2 = new ArrayList<Map<String,Object>>();         
for(int j = 0; j < 8; j++) {             
    Map<String,Object> listitem2 = new HashMap<String,Object>();             
    listitem2.put("a", a[j]);             
    listitem2.put("b", b[j]);             
    mapList2.add(listitem2);         
}         
SimpleAdapter adapter2 = new SimpleAdapter(this, mapList2, R.layout.item3, new String[]{"a", "b"}, new int[]{R.id.textView10, R.id.textView11});         
listView2.setAdapter(adapter2);