3.建造者模式
AlertDialog.Builder builder =
new AlertDialog.Builder(context)
.setIcon(R.mipmap.ic_launcher)
.setTitle("This is title")
.setMessage("This is Message")
.setPositiveButton("ok", null)
.create();
builder.show();Builder(建造者模式)的UML类图

建造者模式的简单实现
总结
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